Creating a constraint property on a parametric diagram (SysML)
For information about creating a Constraint Property through an appropriate pane, click here 
On a Parametric Diagram, you can create a Constraint Property through the diagram's tab, or by dragging a Constraint Block to the diagram.
Note that on creating a Constraint Property, Constraints that are applied to the Constraint Property's type are also applied to the Constraint Property.
To create a constraint property through the diagram's tab:
1. Open the Parametric Diagram.
2. On the diagram's tab, click the 
Constraint Property button.
Constraint Property button.3. On the diagram, click in free space.
4. To use an existing Constraint Block as a type:
a. In the Options group, click the Existing Type option.
b. Select the Constraint Block that you want to use as a type, and then click OK.
To create a new Constraint Block to use as a type:
a. In the Options group, click the New Type option.
b. In the Name box, type the name of the Constraint Block that will be used as a type, and then click OK.
5. Type the name of the new Constraint Property, and then press the Enter key.
To create an untyped Constraint Property:
◦ In the Options group, click the Untyped option, and then click OK.
To create a constraint property by dragging a constraint block to the diagram:
1. Open the Parametric Diagram.
2. In an appropriate pane, locate the Constraint Block that you want to use as a type for the Constraint Property.
3. Drag the Constraint Block from an appropriate pane to free space on the Parametric Diagram.
4. Set the name of the new Constraint Property through its Property Pages.