I have 2 rental houses need to keep up with rent due and rent paide and expensises . One houes has 3 tenats need help setting up .

Houses are your customers. And sub jobs are your units and tenants.

House123

House123:APT1

House123:APT1:Mr Smith

and repeat House123:APT2:Mrs Jones

House123:APT3:Bob&Tom

You will create recurring invoices to the tenants with due date of 1st of month but posting to books 7-10 days prior (so you can issue statements)

I also suggest using classes, assigned per property tax ID or deed to track all income and expense. You must fill out a Schedule E column for each property separately and P&L by Class is the easiest way to see the results needed. If you have items that are Unassigned or Overhead you must reassign those for taxes or place those separately on a Schedule C or other appropriate form. The IRS does not want to see anything by tenant or even indivicual apartment, just deeded address,

Only professional real estate professionals can combine all or substantially all properties into a single form and 2 houses is not even close.