Use wand A with 2 charges, target wand B with two charges. Wand A now has 4 charges and wand B is gone. Or maybe it’s A that is gone... either way the wands are combined into one.
I take a bag of wands (all the same) and run this: http://uorforum.com/threads/combining-wand-macro.37525/#post-358663
Marlboro Man: I have a 22-pack on my vendor for 50K (Vendor Allele, 39N/69E just outside of Cove Gates)