Yes, you need to manually code your item button and it will also need a script to manage the calculations. What you have in mind cannot be done using the online button creator.
Below is an example you can tinker with:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<title>Button Example Code</title>
<!-- START META TAG SECTION -->
<meta charset="utf-8">
<meta http-equiv="Content-Type" content="text/html;charset=utf-8">
<meta http-equiv="Content-Language" content="en">
<!-- END META TAG SECTION -->
<!-- Start of Script -->
<SCRIPT type=text/javascript>
<!--
var ac = 0; // table for qty/amt pairs
var aqty = new Array (); // qty brkpt
var aamt = new Array (); // amount to charge
var pc = 0; // table for qty/percent pairs
var pqty = new Array (); // qty brkpt
var pper = new Array (); // percent to discount
function Dollar (val) { // force to valid dollar amount
var str,pos,rnd=0;
if (val < .995) rnd = 1; // for old Netscape browsers
str = escape (val*1.0 + 0.005001 + rnd); // float, round, escape
pos = str.indexOf (".");
if (pos > 0) str = str.substring (rnd, pos + 3);
return str;
}
function ReadForm (obj1) { // quantity based discounts
var i,amt,des,qty;
amt = obj1.baseamt.value*1.0; // base amount
des = obj1.basedes.value; // base description
qty = obj1.qty.value; // get user quantity
if (isNaN (qty) || qty < 1) { // make sure it's good
alert ('"' + qty + '"' + ' is not a valid number!');
ac = 0; // always zap the table
pc = 0;
return false; // th-th-that's all, folks.
}
qty = qty*1.0; // force to numeric
for (i=ac-1; i>=0; i=i-1) { // run table backwards
if (qty >= aqty[i]) { // use this entry
amt = aamt[i]; // this is the real amount
break; // get out, we're done
}
}
for (i=pc-1; i>=0; i=i-1) { // run table backwards
if (qty >= pqty[i]) { // use this entry
amt = amt - (amt/100.0 * pper[i]);
break; // get out, we're done
}
}
obj1.item_name.value = des + ", " + qty + " Widget(s) @" +
Dollar (amt) + " each.";
obj1.amount.value = Dollar (amt * qty);
ac = 0; // reset item discount
pc = 0;
}
function SetAmt (q1, a1) { // set up a quantity-based amount table
var i;
ac = 0;
for (i=0; i<arguments.length; i=i+2) { // build the table
aqty[ac] = arguments[i]; // get real args and store
aamt[ac] = arguments[i+1];
ac = ac + 1; // number of pairs in table
}
}
//-->
</SCRIPT>
<!-- End of Script -->
</head>
<body>
<!-- START SAMPLE CODE SECTION -->
<!-- PARAGRAPH 1 -->
Discount & Coupon Examples
<br><br>
Buy More, Pay Less - Add to Cart Item Button.
<br><br>
Widgets
<br><br>
1-4 Widgets - $5.00 each
<br>
5-9 Widgets - $4.20 each
<br>
10 or More - $3.30 each
<br><br>
<!-- Start of Add to Cart Form -->
<!-- Note: target="paypal" was replaced with the variable target="_self" -->
<!-- Note: shopping_url also added to code -->
<!-- These two changes allow better functionality with IE and Firefox -->
<FORM onsubmit="this.target = '_self'; SetAmt (1, 5.00, 5, 4.20, 10, 3.30); return ReadForm (this);"
action="https://www.paypal.com/cgi-bin/webscr" method="post">
<!-- If using a Business or Company Logo Graphic, include the "cpp_header_image" variable in your View Cart code. -->
<input type="hidden" name="cpp_header_image" value="https://yourwebsite.com/logo.jpg">
<input type="hidden" value="_cart" name="cmd">
<input type="hidden" value="1" name="add">
<!-- Replace "business" value with your PayPal Email Address or Account ID -->
<input type="hidden" name="business" value="your email address">
<input type="hidden" name="item_name">
<input type="hidden" value="01-001" name="item_number">
<input type="hidden" name="amount">
<input type="hidden" value="2" name="no_shipping">
<!-- Replace value with the web page you want the customer to return to -->
<input type="hidden" name="shopping_url" value="http://www.yourwebsite.com/Shop.html">
<!-- Replace value with the web page you want the customer to return to after a successful transaction -->
<input type="hidden" name="return" value="http://www.yourwebsite.com/ThankYou.html">
<!-- Replace value with the web page you want the customer to return to after item cancellation -->
<input type="hidden" name="cancel_return" value="http://www.yourwebsite.com/Cancel.html">
<input type="hidden" value="USD" name="currency_code">
<input type="hidden" value="US" name="lc">
<input type="hidden" value=5.00 name="baseamt">
<input type="hidden" value="Widget" name="basedes">
<input type="hidden" name="button_subtype" value="products">
<input type="hidden" name="no_note" value="0">
<input type="hidden" name="cn" value="Add special instructions to the seller:">
<input type="hidden" name="bn" value="PP-ShopCartBF:btn_cart_LG.gif:NonHosted">
Enter Desired Quantity:
<input size="3" value="1" name="qty">
<br><br>
<input type="reset" name="reset" value="Clear Selections" />
<br><br>
<input type="image" src="https://www.paypalobjects.com/en_US/i/btn/btn_cart_LG.gif" border="0" name="submit" alt="PayPal - The safer, easier way to pay online!">
<img alt="" border="0" src="https://www.paypalobjects.com/en_US/i/scr/pixel.gif" width="1" height="1">
</FORM>
<!-- End of Form -->
<br>
<!-- Start of View Cart Button Code -->
<form target="_self" action="https://www.paypal.com/cgi-bin/webscr" method="post">
<!-- If using a Business or Company Logo Graphic, include the "cpp_header_image" variable in your View Cart code. -->
<input type="hidden" name="cpp_header_image" value="https://yourwebsite.com/logo.jpg">
<input type="hidden" name="cmd" value="_cart">
<input type="hidden" name="display" value="1">
<!-- Replace "business" value with your PayPal Email Address or Account ID -->
<input type="hidden" name="business" value="your email address">
<!-- Replace value with the web page you want the customer to return to -->
<input type="hidden" name="shopping_url" value="http://www.yourwebsite.com/Shop.html">
<input type="image" src="https://www.paypalobjects.com/en_US/i/btn/btn_viewcart_LG.gif" border="0" name="submit" alt="PayPal - The safer, easier way to pay online!">
<img alt="" border="0" src="https://www.paypalobjects.com/en_US/i/scr/pixel.gif" width="1" height="1">
</form>
<!-- End of View Cart Button Code -->
<!-- END BUTTON EXAMPLES -->
<!-- END SAMPLE CODE SECTION -->
<br><br>
<br><br><br><br>
<hr align="left" width="50%" noshade>
<br><br>
NOTES:
<br>
In order to test the code, you must replace the "business" value variable with your PayPal Email Address or Account ID.
</body>
</html>
