Vendor A/c transfer

Hi Gurus,

Can someone please help me understand how the vendor master data is transferred from Legacy System? I am aware that we do it master data transfer via LSMW etc. But how the vendor numbers are managed? Is it just with the help of A/c group and Number range? If only the name level info is transfered, how do we transfer the A/c balance? How does the system know that for this vendor this is the balance? (I hope the vendor account balance is also transferred in bulk number). What is the Accounting entry when we do the transfer?

Thanks in advance

J