Vat credit, tran 1 suspense

DEAR SIR,

I HAVE ELECTRONICS (TV,FRIDGE,MOBILE,WASHING MASHINE) SHOWROOMS, I AM PURCHASING FROM VAT DEALER WITHIN STATE AND SALE TO CUSTOMER WITHIN STATE. AND MY LAST QUARTER VAT RETURN (01.04.2017 to 30.06.2017)  AND INPUTS VAT CREDIT BALANCE  APPROX 3 LACS, I HAVE ALL VAT PAID INVOICE . SO I WANT TO TAKE INPUT TAX CREDIT IN GST. SO GO TO GST PORTAL FOR FILL TRAN 1, BUT I CONFUSED IN TRAN 1 WHICH FORM SUBMIT MY DETAILS  FOR ITC LIKE (5A, 5B, 5C, 6A, 6B, 6C, 7A, 7B, 7C, ETC) 

PLEASE SUGGEST

 DUE TO CREDIT MY GSTR 3B FOR AUGUST IN PENDING.