Grayed out general ledger account

Hello,

In my one of the child company, all the general ledger account are grayed out, irrespective of transaction posted or not, active or inactive.

Now some of the account I want to make it active.
How can I do that?

Also, when I’m removing Global status from parent company, still the child company is having the Global status in chart of accounts. How can I remove that also?

Thanks,
Rishi