To Reorder Template Groups

In the Element Templates dialog ( Drawing > Home > Attributes > Element Template > Manage ), select the open DGN file.
Select the template group whose relative position you want to change.
Do one of the following:

To move up the template group one position, click the Move Up icon.

or
Right-click the template group and select Move Up from the pop-up menu.
Do one of the following:

To move down the template group one position, click the Move Down icon.

or
Right-click the template group and select Move Down from the pop-up menu.

Note: If the template group is the first item in the open DGN file it cannot move up. If the template group is the last item in the open DGN file it cannot move down.