drag-down of indirect function does not change cell reference within " "

Formula in B3: SUMPRODUCT(COUNTIF(INDIRECT("'"&Tabs&"'!"&"B1:T1"),B$2))

Please help me to populate the counts for the Bravo Charlie Delta ie B4:G6
by making the right cell reference within " " for them .
This is basically to make the formula in B3 down to B4,B5 and B6 draggable but I cant figure it out since my countif range ie B1:T1 is within ""
Any suggestions for a work around
I have attached the workbook

Thanks
Alsan

See if this solve your problem (in B3 and copy down and across)

Formula:

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Thanks both José Augusto and JohnTopley ,both of your solutions are working fine