How do I offset the bar number? (ie, alter the number)

Because of wanting to use supplementary incomplete bars around double barlines, the score I am writing out in Muse Score will show different bar numbers after the double barline compared with the master-sheet I am working from. In Sibelius, and I think in Cubase, I could adjust the bar numbering at any point. I can't see how to do that in Muse Score: off-setting here only seems to mean adjusting position, not the number shown.