Attach Functionality in BP

Can we use attach functionality in process level?
I have requirement that we have 2 applications(web & window). i need to navigate these two for doing some kind of business steps. How to use this attach functionality in process level?



Existing code:
1.we created 2 individual processes and these 2 called by 3rd process i.e. main process(build it for multi level).
2.Application launches by respective process studios

New code to build:
1. Both applications launch at a time in main process. And we need to use attach feature in respective process to navigate between the applications.

Could you please suggest how to do it?

when i used attach action inside respective application processes, I m getting error
"Internal : Failed to perform step 1 in Navigate Stage 'Attach' on page 'Attach' - Target application could not be identified"
 
No , Its not working. Getting same kind of error! I observe one thing that when i m testing in debug mode, the BP showing application needs to launch. Find screenshot

if it already attached it should changed to attach right instead of launch?
View attachment 1557923815800.png

"Internal : Failed to perform step 1 in Navigate Stage 'Detach' on page 'Detach' - Not Connected"
 
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