@Ícaro B - By “looked” I assume you mean locked? If so, you cannot keep duplicated objects locked. However, if you have a paid or Education Plan subscription and are wanting to add add a frame of locked objects to the same (or other boards), you could use the Custom Templates feature.

 @Ícaro B I feel your pain, for me it’s not expected behaviour or efficient to have to re-lock things and comes up so often. I created a wishlist item that you can upvote. Fingers crossed!

That said,  @Robert Johnson’s suggestion was a really helpful workaround that I’m about to use - thanks Robert!