Copy and object by right-clicking on the object and choose “Copy” (short command CTRL + C). Paste the object as a copy by right-clicking on the model surface and choose “Paste as copy” (short command CTRL + Shift + V). The new object will then have the word “Copy” in its title. The object then has a completely new ID and changes you make will not affect the original object.
If you would rather copy the object and reuse it somewhere else, you copy the object in the same way but pasting it by right-clicking on the model surface and choose “Paste” (short command CTRL + V). Changes in the properties of the object will then affect the original object since it’s the same object reused. These changes could for example be field values, texts in descriptions, or document links connected to the object. Changes you make regarding size or color of the symbol will not affect the original object.