Moving to Group VAT Steps?

Hi @Ankit_Tiwari and Team,
Please suggest if a company has to move from individual VAT to Group VAT then what will be the steps?

  1. If there are 4 CRN under one group VAT then 4 times CSR will be generated and 4 times certificates with complience will be required although the server is same for all group reportings. Also need to submit 6 documents for compliance at group or for each CRN?

  2. There is exisiting data so that need to be separated as serial/sequence might need to start from 1 again.

  3. Any other changes in XML or related to Group VAT if required.

Thanks