Azure active directory sync user and group from other differenct azure active directory

Hi All,

I have use case about azure active directory sync user and group from other azure active directory.

In this case we have company in singapore is headquarter office. headquarter have azure tenant and azure active directory already. and we have branch in thailand. thailand use child directory sync from headquarter for on-premise domain controller and O365 application aswell.

If branch in th need to create new azure tenant separate from singapore headquarter already tenant. tenant and azure active directory of thailand branch will empty or not ? and must start sync with AADconnect form on-premise to azure?

How can sync user and group from singapore headquarter azure active directoy to new thailand branch azure active directory?

Can suggest and recommend solution.

BR.