Double click the output port of the ﬁrst model instance SawGen#1. The pointer changes to connection mode. Move the cursor towards the input port of the model instance MyAdderModule#1. A line is traced behind the cursor. You can go straight to the input port and complete the connection by a single mouseclick on the port or you can draw a line with 90 degree corners as described in Connect Model Instances. Connect the second model instance SawGen#2 and the second input of the MyAdderModule#1 and the output of MyAdderModule#1 with the input of the Xgraph#1.
Your result should be similar to this: