you need to be a more precise. how much do you want to dilute it by ? do you have pg, vg, and nic base ?
for example, 10 ml of your liquid and 8 ml of pg/vg and 2 ml of your 60 mg/ml nic base would yield 20 ml of new liquid which is diluted by 50 %. If you add 4 ml pg/vg and 1 ml of your nic base to the said 10 ml, you will now have 15 ml, diluted 33.3% and th.e resulting liquid stays at 12 mg/ml nic