write in free style with x/8 flavour

I want to write music in x/8 feeling in free style (ctrl+x) than none: how can I manage this and have 8th by group of three / 4th dotted etc…
I there a solution ? For the moment I put a time signature like 90/8 and incresse the first number when I need?
best regards

I think probably what you’re doing is as good as anything that’s possible in Dorico at the moment. In future we expect to make it possible to define beat groupings for open time signatures, but that’s not currently included as a feature.