Add One Entity to a Model
- 
                Right-click on the "Entity" folder (for example, Points) in the Project Browser and select Add
                        "Entity" from the context menu, or right-click on the "Entity"
                    panel button on the toolbar.
                Tip: You can also right-click on a system in the Project Browser and use the context menu to add an "entity" (for example: Add > Reference Entity > "Entity",Add > Constraint > "Entity", Add > Force Entity > "Entity", Add > Control Entity > "Entity", Add > General MDL Entity > "Entity"). The Add "Entity" dialog is displayed for the current entity type.
- The parent system name is displayed in the System field.
- 
                Enter a label in the Label: field, if you want to use a different label name
                    than the default.
                The label name can be changed at any time.
- 
                Enter a variable name in the Variable: field, if you want to use a different
                    variable name than the default.
                The variable name is required and cannot be changed after it is defined.
- Under Type:, select single or pair, if applicable.
- Select a type (if applicable). For example, when adding a Joint, select the joint type.
- Optional: Enter any notes in the Note: text box.
- 
                Click OK.
                The new entity is added to the model in the current system, and the Add "Entity" dialog is closed.