when i hold CTRL when selecting 2nd solid, shouldnt it subtract from the 1st and 2nd stick around, but when i move 2nd object the subtraction goes away after i let off mouse button. v8 or v9. am i doing something wrong? if i select sphere 1st, then CTRL click the cylinder, a portion of sphere is subtracted off and when i move sphere the subtracted section is indeed subtracted.
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Often I need to do a subtract and still have the original subtracted object. I use a Ctrl+C - Ctrl+V in place. Its not elegant, but it works. It can be quite slow if its a complex object.
Bob La Londe
http://www.YumaBassMan.com
What you are seeing is a history, or "dynamic geometry"..... The sphere get an attribute of "be a cutter on this object" (The link)..... When you move the sphere away, it is no longer cutting the object. In your first scenario, if you move the cylinder away, you will see it is indeed cut..... (That's what you are describing in the second scenario...
You found the answer, but you also mention that removing links was "undesirable" in circumstances.... You described using "edit-remove links", which is kindof a global operation... What you want to do is go to "window-concept explorer" and then select object, to view it's "history" so to speak.... You should be able to find the "single link" you want to remove, without removing "all links" like you described...
Anyway, become familiar with the concept expolorer....