SAP Legacy data Migration Starategy/Process

Hi Friends
I would request you, if anybody let me knwo the process of legacy data migration into sap. What are steps I have to follow while doing legacy data migration. My questions are:
1) How to upload GL balances from legacy to SAP
2) How to upload Vendor and Customer open items into sap
3) Asset balances How to upload
4) what is the use of Migration clearing accounts.
Kindly provide if any documents for legacy data migration into sap.
Thanks in advance

Dear Rao,
Just check the bwlow link you can understand easly to upload the balances.
Check the bwlow procedure for the same way do it.
First create 5 Dummy GL codes. These GL code should be zero at the end of uploading balances.
1     GL Offset Account               Dr
          Asset Offset Account          Cr
          AP Offset Account          Cr
          Sales          Cr
          Other GL's          Cr
2     Cash               Dr
     Consumption               Dr
     Asset Offset Account               Dr
     AR Offset Account               Dr
     Material Offset Account               Dr
     Other GL's               Dr
          GL Offset Account     x     Cr
3     AP Offset Account               Dr
          Vendor 1          Cr
          Vendor 2          Cr
          Vendor 3          Cr
4     Customer 1               Dr
     Customer 2               Dr
     Customer 3               Dr
          AR Offset Account          Cr
5     Fixed Asset 1               Dr
     Fixed Asset 2               Dr
          Asset Offset Account          Cr
          Acc. Depreciation Account          Cr
6     Stock Inventory Account               Dr
          Material Offset Account          Cr

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