EXCEL - Set a cell's value based on a value in another worksheet

I have a spreadsheet with 2 worksheets and am trying to set a value on one worksheet based on a value in the other worksheet using an excel formula. An example follows:

Worksheet 1 (WS1) has three columns (1) WS1-ROWID, (2) WS1-EXTERNALID, (3) WS1-DESCRIPTION, and (4) WS1-QUANTITY
Worksheet 2 (WS2) has two columns (1) WS2-ROWID AND (2) WS2-EXTERNALID

There is a one to many relationship between the two worksheets. For every row in WS2 there are 1 or more rows in WS1
The worksheets are related by the WS1-EXTERNALID and the WS2-EXTERNALID

I am trying to populate WS1-ROWID in WS1 with the value found in the corresponding WS2-ROWID. So, if WS1-EXTERNALID = WS2-EXTERNALID, set WS1-ROWID = WS2-ROWID

I probably didn't explain that real well but I've also attached a sample spreadsheet that should describe what I am trying to do.

Any help will be greatly appreciated.
C--Users-cameraop-Desktop-Spreadshe.xlsx
cbridgmanAsked:
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KoenChange and Transition ManagerCommented:
is this what you need ?

write in Worksheet 1 , cell a2 : = index('worksheet 2'!$a$2:$a$5, match(b2,'worksheet 2'!$b$2:$b$5,0))
and copy down...
ee_index.xlsx
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cbridgmanAuthor Commented:
Thanks Koen,

That is just what I was looking for.
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Microsoft Excel

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