hello it’s bit complicated to me to explain myself properly so i tip few labels on my model so you’ll figure out what is my issue… thanks so much for the help 
You’ve got the faces you want to remove buried too deeply in nested groups and the edges defining what you want to remove aren’t in the same group. Push/Pull would be the inappropriate tool anyway since the face you’d push isn’t perpendicular to the geometry you want to remove.
Explode all those unneeded groups. They only get in the way. Then just erase the erges for the corners you’re trying to get rid of.
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i can’t explain how i appreciate your time, effort and given help Dave! that makes me so happy :)
lesson learned 
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sorry, can you explain me how to remove the groups without deleting existing components?
ok just exploding… sorry got it… so 100% understood thanks