If you are willing to be limited to a maximum of three letters for the company name, you can use a formula:
=CONCATENATE(LEFT(B3,1),MID(B3,FIND(" ",B3)+1,1),IFERROR(MID(B3,FIND(" ",B3,FIND(" ",B3)+1)+1,1),""),TEXT(H3,"DDMMYY"))
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solved How To Automatically Generate Invoice Number In Excel? [closed]