How can I import the custom shape to my shape?

[RayPenber]

I draw it with 3 rectangles and when I union them, the unioned shape changes to a rectangle . Please tell me how can I union it and how can I import the unioned shape to my custom shape .Thank you!

[yohst2]

Adding shapes to a stencil;

• open/select the stencil you want to add your shape to
• notice the little gear icon in upper right corner of opened/selected stencil, click it and select edit stencil.
• your stencil opens in its own canvas
• copy your shape from the canvas you worked on and paste it in the stencil canvas.
• save stencil.

For reference: https://support.omnigroup.com/documentation/omnigraffle/mac/7.0/en/using-and-creating-stencils/

[roosterboy]

I draw it with 3 rectangles and when I union them, the unioned shape changes to a rectangle .

Yeah, that’s how unioning works; all of the selected shapes get merged into one shape.

It sounds like what you really want to do is group your objects together, not union.