How to import/merge 2 Smartsheet projects plan into 1?

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I need to import an existing project plan (call it A) into an already project plan (call it B).

A is under a different corporate account than B.

I have access to both. I need to merge the 2 project plans into 1. The question probably has been asked but I can't find a "real" answer.

Thanks for your help!

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