Yes if you input the same value for F2, F4 and F6 as equal to the width of your rectangular section and specify the F1 and F3 appropriately for the varying depth, you would be able to model a rectangular tapered member. When you are specifying a member of varying depth, it is a requirement in STAAD.Pro that the depth at start should be more than the depth at the end ( F1 > F3). So when you define the member, ensure that the node at which the depth is higher, is defined as the first node in the member incidence.
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