Top menu >> Setup >> Select process >> Settings

This is a handy feature that allows you to copy the security settings from another process that you are using. 

Example: you are editing the setup of process 'A'. Clicking Copy from will let the user select another process 'B' and it will set the security of process A (all the settings) to what is in process B. The user still has to click OK to save the changes on A.

Click Settings

Click Copy from a process.

Select the process you would like to copy the security settings from