Multi-year Subscription Setup

We are a software distributor and sell 3 year subscription licenses. We buy the subscription from our vendor and they bill us annually (increasing each year). We also bill our customer annually, but each year the price scales - ex. Y1: 10K Y2: 20K Y3: 30K.

We are looking for the best way to evenly spread the total revenue and cost for all 3 years, while billing annually. Currently, we enter each year as a line on the sales order and recognize revenue through ARM. We post unbilled receivable revenue adjustments to catch up the revenue.

The cost side is the challenge. We are billed for 1 year at a time and attach an amortization schedule that recognizes cost over the subscription term. However, we can't match cost to revenue without a manual journal entry for each subscription.