Adding table control to VA41 additional data tab

My requirement is to add table control in the addtional data tab of the t-code VA41 so that user has got some flexibilty to add some more data in the table control to the contract.

If user uses t-code VA42 should be able to change the entries in the table control field and then save then to the database as other normal entries.

If user uses t-code VA43 then the table control should display all entries added to the table control with other normal data.