Consolidating shapes

I have a model that started as a copy of an existing model and has subsequently gone through numerous modifications, adding new parts and removing parts using groups and holes. Whenever I load the model in TinkerCad I briefly see all the old redundant groups and objects, which indicates to me that they are still defined in the design files. I also see that the size of the saved STL file grows as I make more changes. How does one consolidate all the changes into one 'pure' object (realizing, of course, that there would be no way back from such an action) ?

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