Transferring between accounts

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I have set up a workspace and would like to transfer my sheet and dashboard into the company's fully licensed account. Unfortunately, I dived in setting up a project before I realised that there were restrictions that would require an upgrade after a few weeks :-(

Good news, there is an official company account I'm now part of; bad news, I don't want to lose the work I've done to date, and I can't see how to execute this transition.

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