You can choose not to withhold income from select sources.
Catch is able to detect your income sources when you link your external bank. These income sources will appear on the home screen (example pictured below, with income sources from Square, Cash App, and Doordash).
For each source, you can roll (transfer into your account), skip, or ignore. If you'd like more control or want to automate this process, you can always make changes on the income page.