Text boxes and images

You want to reuse custom assembly symbols from Word’s Shapes menu rather than rebuild them in every document. Word does not provide a supported way to add user-created entries to the built-in Shapes gallery. In desktop Word, create the object with Insert > Shapes; use Freeform or Scribble if needed, add text or images, then Ctrl-select the components and choose Shape Format > Group > Group. Select the object and choose Insert > Quick Parts > Save Selection to Quick Part Gallery. Give it a name and category, and save it in Normal.dotm or a dedicated template when Word prompts for the storage location. You can then insert it from Insert > Quick Parts in later documents. Quick Parts and AutoText can store text and graphics, making them the supported reusable-content alternative. If several people need the same symbols, distribute a controlled Word template containing those building blocks.