Do you want to do this with formulas or code?

It's tricky with a formula because you want the result in the same
column as the data. Can I suggest using column E? Using MCONCAT
function from the MOREFUNC add-in you can use this formula in E2 copied
down

=IF(D2<"",D2,MCONCAT(D3:INDEX(D3:D$100,MATCH(TRUE ,D3:D$100="",0))))

confirmed with CTRL+SHIFT+ENTER

MOREFUNC add-in is available to download from here

http://www.rhdatasolutions.com/morefunc/


--
daddylonglegs
------------------------------------------------------------------------
daddylonglegs's Profile: http://www.excelforum.com/member.php...o&userid=30486
View this thread: http://www.excelforum.com/showthread...hreadid=515137