To constrain the rectangle to a set size

1. Open Pro/DESKTOP
2. From the File menu select New
3. Choose Design
4. Select OK
5. Maximise both screens
6. From the Workplanes menu choose New sketch
7. Name the sketch Tray ensure that the workplane shows Base
8. In the dialogue window select OK
9. Choose the Create Rectangle tool.
11. Move the pencil cursor to the workplane (Green rectangle with arrow on).
12. Move to just inside the top left corner of the green rectangle,.
13. Press and hold and drag the cursor down to the right to create a rectangle. Release the mouse button to finish creating the rectangle.
14. From the View menu choose Plan

The PARAMETRIC of Pro/DESKTOP uses numerical values to constrain the size of object such as lines or circles or separations.

1. Choose the Constrain Separation tool
2. Move over a side of the rectangle (The selected line goes light blue)
3. Select the line by clicking the left mouse button. (The line turns red)
4. Select the opposite line, press, hold and drag the cursor to create the constraint outside the rectangle
5. Repeat on the other two lines that make up the rectangle
6. Double-click the left mouse button on a constraint to open the Properties dialogue window.
7. Enter a length of 400mm and repeat for the other constraint to make the width 250mm.
8. From the View menu choose half-scale to allow some room to work on the edges of the rectangle