In above screenshots,
http://wp-types.com/forums/topic/custom-field-separate-image-links/#post-96983
I can not find where to store "each sponsor a link to a specified page or site"
So I can only guess that happened in your website, I suggest you try these:
1) Add a custom URL field with Types, for example "my-url", rigister it to your custom post type "footer sponsors"
http://wp-types.com/documentation/user-guides/using-custom-fields/
2) fill in URL value for each "footer sponsors" post,
3) modify your shortcodes in content like this:
<a href="[types field="my-url" raw="true"][/types]">[types field="sponsor-logo" title="sponsor-logo" width="150" height="150" proportional="true" align="left"][/types]</a>
http://wp-types.com/documentation/functions/#URL
It should DO "select posts from my "footer sponsors" and MAKE each sponsor a link to a specified page or site"
If you need asssist to do it, please send the login details to my email: luo.y@icanlocalize.com
Thanks