Legacy Data Transfer

Hi Experts,

From the information I have gathered so far regarding legacy data transfer, the following steps need to be done:

1) Create the transaction

2) Settle the transaction ( else change the processing category)

3) post the transactions using TBB1_LC

However, in case of valuation specific information I have the following concerns:

1) Is there any specific Tcode which will provide me this valuation related information which needs to be maintained in tcode: TPM63C or TPM61A for OTC , securities and Derivatives as our legacy data is maintained on SAP itself.

2) In case of securities , is the creation of securities position indicator Tcode:TPM61 necessary to be created?

Kindly provide your guidance on the above.

Thanks & Regards,

Sneha