Only the following constraint-types may be parameterized:

To assign a parameter to any of these constraint-types, you simply Assign the constraint to the desired element(s), and enter the parameter name (enclosed in quotes) when prompted to do so.

Only those constraint types that support parameters will prompt you for them. If the named parameter does not exist, then Parametric Design creates a new parameter with this name, as explained above. If a parameter with this name does exist and matches the unit requirements of the constraint, it becomes associated with the constraint.

Parameter names are text strings. They must adhere to the naming rules for Creo Elements/Direct Drafting macros. Parameters cannot have the same name as an Creo Elements/Direct Drafting keyword, (e.g. rad or CONFIRM). To avoid such conflicts, parameter names should begin with an uppercase letter, and contain only lowercase letters, integers, and/or the underscore (_) character in the remaining positions. The names Distance, Rad, Dim_3, and My_line are examples of valid parameter names. The software always displays parameter names with the first letter uppercase and remaining characters lowercase, regardless of how you enter them.

It is always a good idea to choose parameter names that are as descriptive as possible - especially if you are parameterizing a part that other people will use as a master part. A draftsperson is much more likely to understand the purpose of the parameter Circle3_radius than the parameter Wwxyzz.

Once you assign a parameter name to a constraint, the parameter remains assigned until you assign a different parameter name to this constraint, or until you Free the constraint.