Creates a new, empty, group model part as a child of this part, at the same pivot point
Takes two arguments, the new part's name, and optionally its parent type
overload 1:
models:newPart(name)
| Method Property | Fluent Description | Representation |
| name accepts | a String | |
| Return Value | a ModelPart | |
overload 2:
models:newPart(name, parentType)
| Method Property | Fluent Description | Representation |
| name accepts | a String | |
| parentType accepts | a String | |
| Return Value | a ModelPart | |