so, if you're saying you want to store 203*;204*;206*;280* in a cell then you could use something like below, where $C2 holds the delimited criterion
Formula:
B2:
=SUM(SUMIFS(Data!$A:$A;Data!$B:$B;MONTH(B$1);Data!$C:$C;TRIM(MID(SUBSTITUTE($C2;";";REPT(" ";100));1+100*(ROW(A$1:INDEX(A:A;($C2<>"")+LEN($C2)-LEN(SUBSTITUTE($C2;";";""))))-1);100))))
copied down
in summary, in the above, you're not creating an inline array but rather you're creating an Array of criteria by splitting the delimited string into 1 to n individual elements
if you modify the string in C2 so the result in B2 should update accordingly... the substitute etc is a bit convoluted as you try to ensure the array of criteria is only as big as the number of elements in the delimited string.
edit: adding a worked example to illustrate, in case helpful.
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