Custom group level template creation issue

I don’t have this option enabled which is mentioned on the below link Custom group-level project templates | GitLab

Do you have any workaround for this?

I checked on the below link but i am not getting any API to fulfil this requirement.

Please suggest me solution its very urgent.

Please kindly do reply to me.

Do you have premium subscription to gitlab? If not then this is why you dont have it. It is clearly marked in the docs.

If you have premium then contact gitlab support directly using their ticket system.