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The object type is ElementReference:
Looks like this:
Add the references (all pumps)
Hit the go button:
You do have to make sure your new child references are all unique under the new parent of course - there are some tricks if this is not the case.
75K is a big database to manually edit, are you fetching the structure from an asset management system or something?
Please let me know if I haven't understood your question.
Thanks so much, Rob, this is exactly what I was looking for!
I was provided with an export from SAP and yes, it is big. This is the initial build out, though, so future effort should be for the deltas only.