bank main A/C and Sub A/C

SAP guru's,

I have one doubt related to bank a/c.

in house bank configuration we maintain GL A/C .

but when we do reconciliation that time it reconcile with bank main A/C , so where we maintain bank main A/C wher we configure bank Main A/C. how we establist relation bank main A/C and BanK sub A/C.

plz explain me.

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regards,