You can edit prices for one or more colorways. Colorways should not be locked. To do so, follow thes steps:

1. View the colorway you want then select Edit prices from the Actions menu as shown below:

You can also click the checkbox(es) next to the colorway you want then click the Edit prices button from the lower toolbar as shown below:

When the button is clicked, the following window appears:

Depending on the price groups defined for the catalog, the above window might differ. 

2. Update any of the prices, 
3. Click Update.