Rental income can be added in the REO tab (under the Application collection).
From there, you can add a new REO, or edit an existing one.
Setting the Occupancy Type to Investment Property will add two new fields, Monthly Gross Rental Income and Gross Rental Income factor.
For borrowers with a lease agreement, specify the gross rental amount and then use a factor of 75%. For borrowers with rental income reported on the schedule E, use the standard FNMA calculations and then use the adjusted rental income as a factor of 100%. The system will compute the monthly adjustment passed on PITI on the REO in the REO fields.