Query regarding formation of similar match data

In the attached file I put your dates in column A from A22 downwards, and this formula in B22:

=VLOOKUP(COUNTIF(A$22:A22,A22),$A$4:$B$6,2,0)

In C22 I used this formula:

=INDEX($C$4:$GF$6,MATCH($B22,$B$4:$B$6,0),MATCH($A22,$C$2:$GF$2,0)+COLUMNS($C:C)-1)&""

which can be copied across into D22:H22. Then those formulae on row 22 can be copied down as far as you need.

Hope this helps.

Pete

Thank u very much.
It is working.
Can you please please explain the detailing about +COLUMNS($C:C)-1)&""