On the sponsorship settings page in your admin panel, there are instructions noting that you can use multiple levels by separating the desired values for each level by commas. You must have a unique item number for each level of sponsorship, and you must fill in all the other values as well so that you have the same number of commas in each field.

You will also need to edit your sponsorship template to give your members the option to purchase at each level. To do this, copy the existing content that shows the first level, and change the number 1 to 2 in all of the template variables where 1 appears ({SPONSORITEM1}, {SPONSORCHARGE1}) to make it show the 2nd level. Repeat with the number 3 and onward for as many levels you have. As an example, here's what you could use in a two-tier image sponsorship template (please note: it's generally better and cleaner to use paypal's button generator to create the payment button for the specific product at the desired price instead of using this generalized version):

<p>You may purchase sponsorship at either level 1 or level 2, with level 1 giving you the best positioning and level 2 being slightly cheaper.</p>

<IF >
Buy level 1 sponsorship for only ${SPONSORCHARGE1} per day!
<form action="https://www.paypal.com/cgi-bin/webscr" method="post">
<input type="hidden" name="cmd" value="_xclick">
<input type="hidden" name="business" value="">
<input type="hidden" name="undefined_quantity" value="1">
<input type="hidden" name="item_name" value="WSN Knowledge Base Sponsorship">
<input type="hidden" name="item_number" value="{SPONSORITEM1}">
<input type="hidden" name="amount" value="{SPONSORCHARGE1}">
<input type="hidden" name="no_shipping" value="1">
<input type="hidden" name="return" value="http://scripts.webmastersite.net/wsngallery/manual/paypal.php?showsite=1">
<input type="hidden" name="cancel_return" value="http://scripts.webmastersite.net/wsngallery/manual">
<input type="hidden" name="no_note" value="1">
<input type="hidden" name="currency_code" value="USD">
<input type="hidden" name="on0" value="linkid">
<input type="hidden" name="os0" value="{LINKID}" maxlength="200">
<input type="image" src="https://www.paypal.com/images/x-click-but23.gif" border="0" name="submit" alt="Make payments with PayPal - it's fast, free and secure!">
</form>
</IF>


<IF >If you're cheap, you can buy level 2 sponsorship at the great discount rate of ${SPONSORCHARGE2} per day.
<form action="https://www.paypal.com/cgi-bin/webscr" method="post">
<input type="hidden" name="cmd" value="_xclick">
<input type="hidden" name="business" value="">
<input type="hidden" name="undefined_quantity" value="1">
<input type="hidden" name="item_name" value="WSN Knowledge Base Sponsorship">
<input type="hidden" name="item_number" value="{SPONSORITEM2}">
<input type="hidden" name="amount" value="{SPONSORCHARGE2}">
<input type="hidden" name="no_shipping" value="1">
<input type="hidden" name="return" value="http://scripts.webmastersite.net/wsngallery/manual/paypal.php?showsite=1">
<input type="hidden" name="cancel_return" value="http://scripts.webmastersite.net/wsngallery/manual">
<input type="hidden" name="no_note" value="1">
<input type="hidden" name="currency_code" value="USD">
<input type="hidden" name="on0" value="linkid">
<input type="hidden" name="os0" value="{LINKID}" maxlength="200">
<input type="image" src="https://www.paypal.com/images/x-click-but23.gif" border="0" name="submit" alt="Make payments with PayPal - it's fast, free and secure!">
</form>
</IF>

<IF >
For those who don't like paypal, here's another alternative payment method. Level 1:
<form method="post" action="https://www.2checkout.com/cgi-bin/ccbuyers/purchase.2c">
<input type="hidden" name="sid" value="">
<input type="hidden" name="product_id" value="{SPONSORITEM1}">
Purchase <input type="text" size="3" maxsize="4" name="quantity" value="1"> days of sponsorship <INPUT type="submit" value="Click to pay through 2CheckOut">
</form>
And level 2:
<form method="post" action="https://www.2checkout.com/cgi-bin/ccbuyers/purchase.2c">
<input type="hidden" name="sid" value="">
<input type="hidden" name="product_id" value="{SPONSORITEM2}">
Purchase <input type="text" size="3" maxsize="4" name="quantity" value="1"> days of sponsorship <INPUT type="submit" value="Click to pay through 2CheckOut">
</form>

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</IF>