Please implement the Merge=Yes/No option inBooleanUnion command, as discussed in Boolean union and merge coplanar planes
It appears ready to go based on the comments in https://mcneel.myjetbrains.com/youtrack/issue/RH-83171/BooleanUnion-Added-MergeCoplanarFacesYes-No-option
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Hi David -
Vanessa tested that issue and reported that it was implemented in 8.11.
Here in 8.14, I see this on the commandline:
Command: _BooleanUnion
Select surfaces or polysurfaces to union ( DeleteInput=Yes MergeCoplanarFaces=Yes )
Select surfaces or polysurfaces to union. Press Enter when done ( DeleteInput=Yes MergeCoplanarFaces=Yes )
Boolean union in progress… Press Esc to cancel
Which version are you running?
-wim
Note you won’t see the option if you preselect objects…
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Thank. I was asking for it but havent updated to latest version. So I’ll do it now .
Thanks you so much!!. It really helps me being able to keep the coplanar surfaces as is 
Solved.