With BiaB you can only take a beat away, you cannot add one.

So if your time signature is 3/4, that's the maximum you can get.

Two workarounds:

A: Start with a 4/4 style but set the number of beats in the bar to 3 (use F5 bar settings for this) - see 1 & 2

B: Start with a 3/4 style and then change to a 4/4 style at the required bar, also using bar settings (F5) - see 1

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