Calculating sums in layout with 3 databases

Can't remember how to do this and FM Help isn't helping. Thanks for
you indulgence on this very basic query:
This is database for a business. The layout in question draws from 3
databases (Customers, Jobs, Mileage). The layout shows the customers,
jobs, mileage, wages for a years' time. I want to have a totals of
wages and mileage appear at the bottom of the layout. What sort of
field am I creating, do I create it in the Customer or the Jobs or the
Mileage database and in which part of the layout do I put it?

thanks so much for your help.

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