Every time you access the Quote > Part Details > Costing sub tab > you must select "Include Assemblies." This is annoying. IMO, it should be checked by default because it give an incorrected Cost and Profit calculation if you don't include the assemblies.
In contrast, in Job Entry module > Pricing tab > Costing sub tab > you can select "include assemblies" and navigate through all the tabs of job entry and the "include assemblies" box remains checked until you close out of the Job module