Magic items with "charges"

[kdarc]

In my current fantasy campaign, I'd like to give their mage a wand or staff or rod of some kind. I'm using the threshold magic variant from Thaumatology and in relation to that, I have decided that items have their own power tally.

I wish, however, to emulate a mechanic of magic item "charges", a bit like wands in that other game 3.5 and as seen in the Elder Scrolls games. Have anyone ever handled this before and could give some advice.

My immediate idea is to make the number of charges equal to the default threshold number and have them being "spend" when it is reach.

[Kromm]

You may find this post useful.

[kdarc]

Just what I was looking for. My thanks!

[Gretik]

Seemed simpler to bump an existing (if old) thread.

Is there a solution to this idea utilizing Ritual Path Magic?

[Edit] Might have solved my own question. Just searched/found that stacking spells are restricted by subject, not by charm or such.
Seems reasonable that you could create a wand and carve charms onto it, or for a more modern vibe use sticky labels. Use a spell, burn off a label/carving.