Does anyone have a method for setting a rule, when random-amount deposits into account, take 30% and move to other account? The amount changes every week, so it

Does anyone have a method for setting a rule, when random-amount deposits into account, take 30% and move to other account? The amount changes every week, so it needs to be percentage not a static number. Seeing some interesting things in this thread, may be that some of them are normal for Europe or what have you. Other things talk about automatic this and auto that - but not specific about what makes it automatic? You bank web site? Interesting just thinking about how some of these things are working, and if there are business account type solutions that are similar.