Help w/ charting three lines in the same chart.

Looking to chart three lines.
1. Inventroy amount (Left)
2. Inventory Utilization % (Right)
3. Inventory Utilization % Target (Right)

So far I've only been able to chart the first two line on separate line charts. If try to combine the two lines on one chart...the Utilization % line will not show. How can we have the utilization line show up on the right side of the chart? thanks for your help.

Frankee