Modifying the attributes of toolpaths is easily managed through the Tools | Options.
To modify the attributes of your tool path, open the TopSolid Options window.
You can find this in the Tools pull down menu.
The Options window allows you to modify the configuration of TopSolid.
Next navigate to the Cam Options and then to Attributes.
From there, you only need to select the color box or line type that you want to modify. The picture below will help you identify how the modifications can impact the tool paths attributes.
Note: Once you modify these attributes, you will need to rebuild your tool path (Control+R) for the changes to take affect.