Hello,
As I understand, you want an array for getting more gain, not for getting increased bandwidth.
Basically, you can couple them with a corporate feed network, or a series feed network. Combinations are possible also.
Do a search on: Patch array series feed and patch array corporate feed. This will guide to ideas how to distribute the power across the patches.
I am not familiar with HFSS. Is your problem in the design of the array, or in how to use the SW.