You'll find some information about this in the Ram Foundation manual, see section 3.3.2 Case of Spread Footing Intersecting Continuous Footing.
In a nutshell, you can model a single continuous footing to support the wall and pilasters, or you can model a continuous footing and spread footings. In the latter case the spread footings are designed for the column pilaster loads only and the continuous footing for the wall forces. How you frame the beams above of course affects what those loads are.
A third option is to model a mat foundation under the group and export that to Ram Concept for foundation design (if you have access to Ram Concept). This has the advantage that it's all one meshed foundation and it can have bi-axial demands or non-rectangular shape.
The Ram Foundation FAQ is also helpful:
