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How can i bring back car alignment when i'm on simple alignment ?

Have part aligned to ABC datum system it was told car alignment is no needed, but now they changed their mind.

I made first alignment on part like plane line point, and i do not know how can i "bring back" the car alignment. 

Do not have coordinates of any elements based on car alignment. 

When ABC is set as alignment and i choose "startup" then i see every feature is "moving" far away from cad is there some trick to make it work ?