How to setup Variation products?

Please follow the steps bellow to create a variation products

Step 1 – Navigate Products > Attributes > Add New Attribute (Ex: Size)
Step 2 – Click to Config icon in the attribute row that you created at the right side
Step 3 – Add New Size for this. Ex: M, L, XL…
Step 4 – Navigate Products > Edit product that you want set attributes
Step 5 – Set Product Variables at the Product Data
Step 6 – Select Size from Custom product Attributes > Click Add
Step 7 – Click Select All from Value text box. Click Used for variations
Step 8 – Select Variations the left menu. Click Go. Click Expand. Input price. Click Save Changes
Step 9 – Publish product

Read more at:
https://docs.woothemes.com/document/variable-product/