Now we will insert two Testing stations, which we created earlier, between PreTest and the Drain.

Left-click the Frame Test  in the folder TestLine. 

Drag it between PreTest and the Drain, and drop it there.

Rename this Frame to Test1.

To create a second test Frame, press Ctrl and the left mouse button over Test1.

Drag Test1 to the right and drop it.

Rename this Frame to Test2.