Ah yes, apparently for all affiliate links on a given ClickBank account, they only allow you to specify a single, common landing page URL, which would typically be your main store page for all products you sell through CB. If you want to offer CB affiliate links with different landing pages for different product lines, then you'd need a separate CB account for each unique landing page, and a separate E-junkie account for each CB account. Email our Support team and tell us how many E-j accounts you'll need, with how many products and MB each; we'll see if we can work with you on that:
https://www.e-junkie.com/ej/contact.php