If you want 3 lines corresponding to 3 measures, you can use the "Measure Values" approach as shown here with the Sales and Profit Measure: Building Line Charts. You can create additional lines by adding other measures to the "Measure Values" shelf. If you want different types of charts with multiple measures on each axis, you can refer to this thread for a discussion and a corresponding idea you might consider voting for: More than one measure for each axis in Dual Axis chart
Agree with Shine here -- you are limited to using Measure Values and one other separate measure to create a dual axis with 3+ measures. However, you cannot use Measure Values more than once, and you are limited to two mark types -- for instance, Measure Values could be several measures represented by Lines, whereas the second axis might be SUM(Sales) or some other measure.