Dear Expert

I have data like Below Mentioned in column A and Column B.I Want to Merge
and Center the Data in Column based on column A.

DEALER NAME
A M MOTORS MALLAPURAM 8
A M MOTORS MALLAPURAM
AALIANZ AUTOMOBILES NEW DELHI 7.35
AALIANZ AUTOMOBILES NEW DELHI
AALIANZ AUTOMOBILES NEW DELHI
AALIANZ AUTOMOBILES NEW DELHI
AALIANZ AUTOMOBILES NEW DELHI
ABHARAN MOTORS UDUPI 7.88
ABT MARUTI CHENNAI 7.89
ABT MARUTI CHENNAI
ABT MARUTI CHENNAI
ABT MARUTI CHENNAI
ABT MARUTI CHENNAI
ABT MARUTI CHENNAI
ABT MARUTI CHENNAI
ABT MARUTI CHENNAI
ABT MARUTI CHENNAI
ABT MARUTI CHENNAI
ABT MARUTI CHENNAI
ABT MARUTI CHENNAI
ABT MARUTI CHENNAI
ABT MARUTI CHENNAI
ABT MARUTI CHENNAI
ABT MARUTI CHENNAI
ABT MARUTI CHENNAI
ABT MARUTI CHENNAI
ABT MARUTI CHENNAI
ABT MARUTI CHENNAI
ABT MARUTI CHENNAI
ABT MARUTI CHENNAI
ABT MARUTI CHENNAI
ABT MARUTI CHENNAI
ABT MARUTI CHENNAI
ABT MARUTI CHENNAI
ABT MARUTI CHENNAI
ABT MARUTI CHENNAI
ABT MARUTI CHENNAI
ABT MARUTI CHENNAI
ABT MARUTI CHENNAI
ABT MARUTI CHENNAI
ABT MARUTI CHENNAI
ABT MARUTI CHENNAI
ABT MARUTI CHENNAI
ABT MARUTI CHENNAI
ABT MARUTI CHENNAI
AGENCY HOUSE PORT BLAIR 8.27
AGENCY HOUSE PORT BLAIR
AGR AUTOMOBILES PVT LTD VARANASI 8.77
AJMER AUTOMOBILES PVT LTD AJMER 8.44
AMAR CARS PVT LTD VADODARA 8.11
AMAR CARS PVT LTD VADODARA
AMAR CARS PVT LTD VADODARA
AMAR CARS PVT LTD VADODARA
AMAR CARS PVT LTD VADODARA
AMAR CARS PVT LTD VADODARA
AMAR CARS PVT LTD VADODARA

I need a Macro.I have 6000 data in one sheet.I have 18 Sheets like this

Thanks in Advance

Hardeep kanwar