Event Handler Header Extension Table

Scenario:

Currently, EH Header Extension Table ID (/SAPRCX/EHEXT) exist in system, based on /SAPRCX/EHEX table.

Tcode: /N/SAPTRX/TSC0ET (See attached file.)

Question:

If I want to add Fields to EH Header Extension Table ID (/SAPRCX/EHEXT) then How I can add new fields ?

or

How to create new EH Header Extension Table ID?

Thanks,

Chan PatelImage may be NSFW.
Clik here to view.