Populating a column based on previous data in 2 other columns

[JJJJ1]

This is what I've come up with so far;

=IF(AND(B1=B2,B2=B3),A1&", "&A2&", "&A3, IF(B1=B2,A1&", "&A2, A1))

It is limited to 3 cells sadly but I need it to work into the thousands.

What needs to happen is (Please see my data set for you)...

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We'll take the spreadsheet for example, it'll where there's a match in B2 and B3, it'll copy C2 and C3 and put in another cell seperated with ", ".

Ideally resulting in a format similiar to -

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I would honestly give a kidney for any help on the matter.

[teylyn]

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[JJJJ1]

I hope this is a little more appropriate.

[shg]

Much better, thanks.

Now post a workbook with before and after examples.

[JJJJ1]

As requested, it's pretty much the same as the text I have posted. I'd appreciate any help on the matter.

Basically, the idea of this is to build up a list of the serial numbers in third column seperated by ", "

[shg]

Try this:

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[JJJJ1]

Thank you for the quick response and I appreciate the effort, but It's comming up with an error on the following line

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Saying subscript out of range, now I've tried searching but I'm unsure as to what i'm supposed to set wks to.

[shg]

Change the word Before to whatever the worksheet name is.

[JJJJ1]

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I've changed it to this with a workbook called Test. In the workbook I open the macro's panel, create new macro and slam it in like normal.

It is still returning the same error

[shg]

It's not the WORKBOOK name, it's the SHEET name--what you see on the tab.

[JJJJ1]

Oh my, thank you and that is working perfectly.

Something I guess i'll have to check for is where there is a space or double space after something in a column.

I really appreciate this, thanks again.