Hello Govind
Kindly find my comments below:
1. Can we do migration again in existing company (already running on by design)
Yes, technically it is not restricted and you can perform the migration again with the different migration posting date. Although this is not an ideal scenario, you won’t able to do the reconciliation properly as the operational postings would be combined with the Migration postings.The Migration posting date acts as a boundary between the operational and migration postings. You will only have migration postings before this date and the operational postings after this.
In an ideal case, the migration at the end of year is performed where you migrate all the data with the migration posting date as the end of year. Then perform the balance carry forward in the By Design system and start fresh from the next year with operational postings in the By Design system.
2. Can we use migration template to move open item balances from subsidiary company to holding company?
This case can be considered as the data coming from other system for the same Holding company. You can use the migration templates to migrate open Invoices.
3. If not, is there any manual way to move balances from company A to company B, so that it will be get paid and reconcile in GR IR clearing?
I don’t think that there is a standard way to just move everything between companies. I think you should follow just one approach rather than mixing them. It means that follow the migration approach for everything rather than doing something manually.
One additional remark related to Fixed Asset, you mentioned that companies share the same master data, but about the transaction data related to Fixed Asset. If both companies had the same assets maintained separately, then you might not need to migrate the asset.
If the companies have different assets, then either you can create new assets or use the same assets and post the additional acquisitions on the assets. Based on your approach, you might have to migrate assets here as well.
This should be tried in the test system first. I would suggest you to take the restore point of your test system before trying out any solution in the test system.
Thanks
Parveen Kumar