Can a single business unit (BU) be used across LEs, impact on costing transfer, Time Management

Summary:

Can a single business unit (BU) be used across LEs, impact on costing transfer, Time Management

Content (required):

Having additional new LE(PSU), PL, BU, and the same LDG, can we GLOBAL TRANSFER the employees to the new LE but on the existing LE's BU, not the new BU, and use the same existing BU's positions?

What is the impact on the GL costing transfer where the new LE's BU has been assigned to a new Ledger?

Is there any impact on the Time Management?

Version (include the version you are using, if applicable):

23C

Code Snippet (add any code snippets that support your topic, if applicable):