Ducts will be inserted on the M1 drawing, where the diffusers were inserted. To insert a duct onto the drawing, go to
DM HVAC 
Duct Centerlines Insert Duct
Design Master HVAC will ask you to specify the first point. Select a point on the left-hand side of the lower hallway near the lobby. You will then select a second point at the opposite end of the hallway. The approximate location of these two points are indicated on the drawing below.
Once you have indicated the two points, the Duct Information dialog will appear as shown below.
Type in "9" for the Starting Elevation and Ending Elevation as shown below, then press OK.
Design Master HVAC will return you to the drawing. Press ENTER to indicate that you have finished drawing the length of the duct. Your drawing should match the one shown below.
Next, insert a piece of duct off of the inserted duct going into the conference room. To do this, go to
DM HVAC Duct Centerlines Insert Duct
When Design Master HVAC asks for the first point, make certain that it connects to the previously inserted duct by using a NEAR osnap. If the Duct Information dialog appears, you did not connect the point of the new duct to the inserted duct. Press Cancel and try again. Make certain the second point of the duct is placed such that it goes past the supply diffusers. After indicating the second point, press ENTER to indicate that you have finished drawing the length of the duct. Your drawing should match the one shown below.
Repeat the Insert Duct command, connecting and inserting a supply duct into Offices 103, 105, and 107. Place the end of the ducts near the supply diffusers. When you have finished, your drawing should match the one shown below.
Next you will insert return ducts.