Hi @rtomar377 ,
Do you want to save your AD Users back to a CDS Entity?
Regarding the needs that you mentioned, I think the Microsoft365Users.SearchUserV2() function and the Patch function could achieve your needs.
A Office AD User should contains the following properties (highlighted in yellow) at least:
On your side, you should create a CDS Entity in your PowerApps, then create corresponding Text type fields for these highlighted attribute.
After that, you could consider generate a canvas app based on your above created CDS Entity. The generated canvas app would contains three screens -- BrowseScreen1, DetailScreen1 and EditScreen1. Please add another custom screen, name it as "New User Screen". Within this "New User Screen", add a ComboBox control, and set the Items property to following:

Note: I assume that you have added the Microsoft365Users connection into your canvas app already.
Set the SelecteMultiple property of the ComboBox to following:
false
Then go to your BroweScreen, set the OnSelect property of the "+" button to following:
Navigate('New User Screen')
Within your 'New User Screen', set the OnSelect property of the "New Entry" button following:
Patch(
'AD Users', // replace it with your own CDS Entity
Defaults('AD Users'), // replace it with your own CDS Entity
{
DisplayName: ComboBox1.Selected.DisplayName,
Mail:ComboBox1.Selected.Mail,
Department:ComboBox1.Selected.Department,
Id:ComboBox1.Selected.Id,
...
}
);
Refresh('AD Users'); // replace it with your own CDS Entity
Navigate(BrowseScreen1)
when select a user from the ComboBox, and press the "New Entry" button, the selected AD User would be saved back to your CDS Entity.
Patch function
Please try above solution, check if it could help in your scenario.
Regards,