"Attachment Point" function is used to define junction points against shapes, parts, assemblies, etc. and to connect them with other objects.
Insert "Attachment Point"
Select the parts and click "Attachment Point" on the Tools tab.
If you click on any point on the object, the Attachment Point will be inserted.
Attachment Point Name and Operation Settings
After inserting an Attachment Point, place the mouse over an Attachment Point and the mouse icon will change "Hand" mark.

In this state, you can right-click and open "Set Name and Behaviors" to set.
Enter "User Name" and specify "Male(_M)", "Female(_F)", or "No Paired".
The username you entered in the name frame + [ _M/F/N ] is displayed.

There are some types of [No Paired] and [Default(~)], and no pair can be used in the left drag drop.
Default is the setting of which junction to default for multiple males, females, and neutrality.
If the default is specified, the default takes precedence in the left track drop.
Also, if the “Coincident(CnP)” constraint is enabled, the part will follow the TriBall's movement even if the join point is changed using the “Attachment Point Connector”.

Please refer to the below.