After the placeholder is created, its name is indicated with the suffix -P0x. To create a colorway, you need to assign a primary color and its color code will replace that suffix, e.g. -001. 

To assign a color to the placeholder, follow these steps:

1. Right-click the placeholder you want then select Assign color as shown in the below example:

You can also view the placeholder details then select Assign color from the Actions menu as shown below:

When this option is selected, the following window appears:

2. Select the primary color you want, 
3. Click Assign, the last 3 digits of the colorway number are changed as per the selected color.