master batching lye

My mom has asked me to ramp up production of my soap to sell at her farm stand and I told her I would do it after my son is out of school for the summer. To do this I will need to make larger batches of master batched lye water. I currently store mine in a repurposed glass jar. I was wondering...

I am very new to soap-making. I more or less follow the cold process but I heat my oils to 160-170F and hold them at temp on an induction range while I mix my lye. I read somewhere that the oils and lye should be within a 10-15F degree range of each other so I mix them at 160-170F, remove it...