Thank you so much for this! :D This has enabled me to save an extraordinary amount of time on one of our admin tasks and will probably save whoever succeeds me in post several days work a month. The explanation of the arguments is especially helpful.
I'm sure advanced users would do this anyway, but I just wanted to add that I had to lock the ranges when applying the lookup all down the column, or it would not look for the previously searched on values, which in my case I need it to do. This means my formula comes out =LookUpConcat(B3,$B$3:$B$6941,$AU$3:$AU$6941) rather than =LookUpConcat(B3,B3:B6941,AU3:AU6941) which is where I was originally going wrong.
Applying the calculation to the whole column takes about 6 minutes if I just sit back and let it work.
Thank you so much.
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