Start a part from the Shape Library

On the Home screen, open Shape Library and pick a family. Eleven are available: Mounting Plate, Circular Flange, L Bracket, Connector Strap, Triangular Gusset, Straight Lug, U Lug, Pipe Saddle, Slotted Plate, Regular Polygon and Web Stiffener.

Each dialog asks for the sizes that define the part. A Mounting Plate takes the plate size, optional rounded corners, an optional central opening and a grid of round holes (up to 16 rows and 16 columns, 64 holes in all). A Circular Flange takes disc or ring diameters and, if you want them, 2 to 64 equally spaced bolt holes.

The dialog checks that the holes clear the outline and each other, and that the shape still makes sense: a Web Stiffener relief must be smaller than half the short side, a U Lug wall must be less than half the width, a Pipe Saddle recess is limited by its radius. Adjust the numbers until the preview accepts them.

What you get is an ordinary sketch and extrusion. There's no live link back to the dialog, so to change it later you edit the sketch and features like any other part. It doesn't overwrite the part you had open.

Save the part, or use Add Sketch to Library to keep the sketch as a .gcmsketch file. Open Library Sketch brings a saved one back as an independent, editable copy.

In a nesting job, Import can select the saved flat outline directly, with no DXF round trip. Set the quantity and allowed rotation as you would for any imported part.