Multiple Accounts

I am working with a pastor that has two churches. He wants to know if it is possible to have them use the same presenter account withpu seeing each others presentations

Probably the two churches should have separate accounts; the pastor can have access to both. If they used the same account, they would be able to see each other's presentations. And songs, and media, and everything else. If they have separate CCLI licenses, then they certainly need separate accounts. See https://www.worshiptools.com/en-us/docs/61-wt-accounts.