Slope
Slope constraints are assigned to linear elements. At solve time, the slope of these elements will be adjusted to match the angle specified by the constraint. If the adjustment cannot be made, Solve fails.
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Slope constraints do not fix the position or length of a line, which may change unless otherwise constrained.
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To assign a slope constraint:
1. Click Parametric and then, in the Create group, click 
Constraints.
Constraints.The Generate Constraints dialog box opens.
2. In the Action area, click Assign.
3. In the Type box, select Slope.
4. Click Apply.
5. Click the linear element to be constrained.
The current slope of this element is displayed in the Creo Elements/Direct Drafting user input line.
6. Choose the angle for the constraint by any of the following methods:
◦ Click 
OK or select another element. The slope will be set to the actual slope of the line at solve time.
OK or select another element. The slope will be set to the actual slope of the line at solve time.◦ Type a specific angle value for the slope in the user input line and press ENTER.
◦ Type a parameter name or Creo Elements/Direct Drafting expression that defines the slope angle (string input) in the user input line and press ENTER.
Each slope-constrained element is labeled with the slope icon, . If the constraint is set to a specific value or parameter name, that information is appended to the icon.