Inputting product mix % via a dashboard

JenniferMontgomery

I have a mix of products which must always total 100%. When forecasting, I would like the ability for the user to either a) type in the product % mix, or b) increase one whilst simultaneously decreasing another (of their choosing) via a dashboard. If possible, could anyone help with how to set up point b?

JenniferMontgomery

Thank you, this is most helpful!