To Move Elemental Geometry From One Level to Another (AutoCAD Mechanical Toolset)

Click Home tabDetail panelHide Situation drop-downEdit. Find
In model space, select an object that belongs to the hide situation you want to edit.
In the tree view, select the level the elemental geometry you want to move belongs to.
Click on the vertical toolbar. The dialog box hides.
With the SHIFT key pressed, click the free object in model space.
Press ENTER. The dialog box displays again.
In the tree view, select the level to which you want to move the elemental geometry.
Click on the vertical toolbar. The dialog box hides.
Click the free object in model space.
Press ENTER.
Click OK.