How to populate the attributes like BU and Legal Entity while creating Lead/Opportunity records

Summary:

How to populate the user attributes such as BU Id and Legal Entity while creating Lead or Opportunity record

Content (please ensure you mask any confidential information):

Hi Team,

Our implementation has requirement to have multiple BU that should be available for selection while creating Leads or Opportunity records.

Any suggestions would be helpful.

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

24C

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