If required, to assist in designing a cooling system, use cooling lines.
Important: Make sure that the required assembly is activated before using this operation.
Press Line (under Cooling Design) on the MoldDesign Guide to run the Line function.
Draw the center lines of the cooling channels. These will be the skeletons of the cooling system.
When you exit the Line function, the Feature Tree now contains a Line feature.

Use the Cooling Channel function to create the cooling channels around the lines.
A cooling channel is created and the Feature Tree now contains the Cooling Cut feature:

Notes:
Only straight lines are considered as the channel axes.
Make sure
that all your skeleton lines are feasible,
i.e. can be created by machining, such as in the example below.

In the example below, the highlighted
lines (in green) cannot be machined.

Drill extensions are automatically created according to user defined parameters.