We may need to clarify terms here, but on the basis of what I think you're asking...
A perspective common to most Western magical systems is that any object with which you have a relationship will absorb your energy to an extent. For example, a childhood toy will have absorbed (probably quite a lot of) your energy and that can be accessed by playing with it again. Larger objects, like, say, a house, also absorb the energy of the people living there, whether that's intended or not. Jewellery is another common example. By and large, you don't have to work at this, it just happens by its having a role in your psyche and by its being in your presence (or vice versa).
If you want to place intense concentrations of your energy (what I think you mean by essence) in an item, then you have to live from your essence. What I mean is that you have to be in a psychological place where you are acting from your deepest sense of You. In the early stages, this will probably only happen in short bursts of clarity but, bit by bit, it becomes your disposition. While you are in one of those "bursts" have an item that you can link to it. It can be anything (even something intangible like a song) but it should be something that is set apart and not used for any other purpose. When you think the moment has passed, take it off/pack it away/don't think about it. When you have a very strong connection to an object, it can act as a vessel for your presence even when you're not there physically. The "cursed" item is a major theme in most of the world's cultures.