Setting up BI Publisher checks for the first time.

We’re upgrading from FSCM 9.1 to 9.2 and switching from Crystal Checks to BI Publisher.  We have at least 6 check templates (*.rtf files) to create.  I read (Document 1420245.1 – EAP: How does Pay Cycle determine which of the XMLP formats APY2021X1, APY2021X1A, APY2021X1C to use when XMLP checks are to be printed?) and have a few questions.

1. Regarding Main Menu > Banking > Banks and Branches > Payment Forms.  Can I Add new custom payment forms?  If so, how do I get the “Preview Image” to work?  Or are we limited to the delivered payment forms?  Can one payment form (for example, CHECK3 – Sample Stub over Check w/Adv) be associated with multiple templates?  For example, we might have 6 templates (.rtf files) that are all similar in format (stub over check w/adv) but with minor differences, like the logo and signature.  Can the one payment form CHECK3 be associated with all 6 templates?  I’m not clear on the purpose of the Payment Form.