Hello Mortimer,
another possibility to get rid of unnecessary elements in the drawing is the following:
Code:
DEFINE Store_to_clean
STORE MI SELECT GLOBAL ALL CONFIRM DEL_OLD 'superdupertmpdatei.mi'
DELETE ALL CONFIRM
LOAD CHECK_2D 'superdupertmpdatei.mi'
END_DEFINE
Drafting stores only the elements that it knows the rest will be deleted.