Well, I don't allow for tolerances ... it is either what I tell them to cut/drill/bend/break etc or they do it again.
I understand your concern I think ... are you speaking for example, part A has a bolt hole that must be within 1/32, the bolt diameter must be within 1/32 and the alignment of the bolt holes from part A to part B must be within 1/32 .. thus if they are all off by the maximum tolerance will they still fit together ... i.e. will a bolt that is 1/32 too large, fit in a hole that is 1/32 too small, that is out of alignment on the parts by 1/32 ... the only way I know of doing that would be to actually create the thing at max tolerance, then check it at min. tolerance.