We have a feature request open for the ability to make one action trigger another, but it's not something the app currently supports. The closest you can come now is something like this:
Change oil - repeats monthly, due on the 1st
Wash car - repeats monthly, due on the 8th
To vote for the action dependency feature, send email to the
support ninjas and they can add your email to the database the team uses to plan and prioritize their work. Thanks!