Compare names to nameID on spreadsheets

I have two spreadsheets.  Spreasheet A is a company list with companyID and companyname.  Spreadsheet B is a list of activites with several fields including a field for companyname.  How do I compare the two spreadsheets and change all the companyname's in Spreadsheet B to the corresponding companyID in Spreadsheet A?

Thanks!
Kevin SmithAsked:
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Saqib Husain, SyedEngineerCommented:
Here is a sample workbook showing one way to use MATCH and INDEX to achieve your objective.
Name-and-IDs.xlsx
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Kevin SmithAuthor Commented:
perfect, thanks!
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