Set up your Line items with DCA using the Main Process Comp as the Boolean. Or if you need to reverse the Boolean, meaning when it's false then create another Boolean line item = NOT Main Process Comp.
When Main is checked then Process Comp opens up and is now editable.
As I understand you would like to have one condition of the boolean driven by a formula and the other by the user as an editable input.
If this is correct then it is not possible to combine these within the same line item.
You will need to create one line item which is driven by a query, another by the user and a final line item which combines the conditions to be used in downstream processes.
The only time you are able to use a formula and manually edit a line item is when version scope is enabled in which you can specify which version is formula drive and which is a user input. But this does not seem relevant for you need.
Good luck, Chris
Chris Heathcote Bedford Consulting
Gold Partner and Regional Partner of the Year 2021, EMEA