Hi.
Here's a workaround with a helper table:
I list unique project names with this array formula in cell I2 of Projects and works tab, copied across:
Formula:
=IFERROR(INDEX($B$3:$B$12,MATCH(1,(COUNTIF($H$2:H2,$B$3:$B$12)=0)*($B$3:$B$12<>""),0))," ")
This formula in cell I3, copied across and down will list work titles under each project name:
Formula:
=IFERROR(INDEX($C$3:$C$12,AGGREGATE(15,6,(ROW($C$3:$C$12)-ROWS($C$1:$C$3)+1)/($B$3:$B$12=I$2),ROWS($C$1:$C1)))," ")
Data validation in Sheet1!B3 can be a hard coded range:
='Projects and works'!$I$2:$K$2
Then this formula for the data validation in C3:
Formula:
=INDEX('Projects and works'!$I$3:$K$7,0,MATCH($B$3,'Projects and works'!$I$2:$K$2,0))
Please run some test and let us know how it goes.
Good luck!
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