Dear Jeremy.
Of course I am using your LookUp plugin.
I just couldn't find a solution on my own.
Up to this point, I have studied and done everything myself. But here I need a little of your support.
I found what it is, it's RoomTag-> TagText but I can't change it, I just get it.

Also, if you look at the parameters of the element, you can see which family is used.

I published this post only because I myself cannot find a solution for 2 days.
As a solution, you can also take the fact to change the text inside the stamp through the code
ICollection<ElementId> SelectedElements = uidoc.Selection.GetElementIds();
using (Transaction trans = new Transaction(doc, "Change selected Elements Mark"))
{
trans.Start();
int i = 1000;
foreach (ElementId id in SelectedElements)
{
Element elem = doc.GetElement(id);
Room roomroom = elem as Room;
RoomTag requiredRoomTag = null;
if (roomroom != null)
{
FilteredElementCollector coll = new FilteredElementCollector(doc).OfCategory(BuiltInCategory.OST_RoomTags).WhereElementIsNotElementType();
foreach (Element ee in coll)
{
RoomTag RT = ee as RoomTag;
Room r = RT.Room;
if (r.Name == roomroom.Name)
{
//Required roomtag
requiredRoomTag = RT;
SpatialElementTag SETag = RT;
TaskDialog.Show("YES", RT.TagText);
}
}
}
}
trans.Commit();
}
P.S.Is it possible to change these values?
