If I have 3 periods (Column C, D, E -row19), as in the above example.
Then I should multiply the corresponding product
on row 21 (and down...) with
INDEX(SOURCE;MATCH($A$20;INDEX(SOURCE;;1);0);MATCH (C$19;INDEX(SOURCE;1;0);0*))

INDEX(SOURCE;MATCH($A$20;INDEX(SOURCE;;1);0);MATCH (D$19;INDEX(SOURCE;1;0);0*))

INDEX(SOURCE;MATCH($A$20;INDEX(SOURCE;;1);0);MATCH (E$19;INDEX(SOURCE;1;0);0*))

respectively.


To get a result in F21, G21, H21
==
F21= C21 *
INDEX(SOURCE;MATCH($A$20;INDEX(SOURCE;;1);0);MATCH (C$19;INDEX(SOURCE;1;0);0*))

G21= D21*
INDEX(SOURCE;MATCH($A$20;INDEX(SOURCE;;1);0);MATCH (D$19;INDEX(SOURCE;1;0);0*))

H21= E21 *
INDEX(SOURCE;MATCH($A$20;INDEX(SOURCE;;1);0);MATCH (E$19;INDEX(SOURCE;1;0);0*))

F22 =C22
**INDEX(SOURCE;MATCH($A$20;INDEX(SOURCE;;1);0);MAT CH(C$19;INDEX(SOURCE;1;0);0))
.... for the nr of items in column B
<==

HTH