Pay Cycle Design/Creation (TMS Implementation)

Good Day Everyone,

We are moving to a third party Treasury Management System (GTreasury). We have never used a TMS before, and I am wondering how everyone has the Pay Cycles setup. Right now we have a pay cycle for every Business Unit by Bank Account. So, right now we basically have 18 different pay cycles. If it is possible how would we setup a single pay cycle that pulls everything into a single file that would get sent to our TMS to disburse?

Also, if anyone has any tips on how to manage a TMS system or implement from an AP standpoint that would be great.