Select Spindles and Toolholders… from the Manufacturing menu.
Select the desired spindle as the Current Spindle. The tool holders for that spindle are listed.
To modify a tool holder, double-click on the tool holder name or click on the tool holder name and click the Properties
button. The toolholder properties dialog box comes up.
To create a new tool holder, click on an existing tool holder name (the dimensions of this holder will be used as the initial dimensions for your new holder) and click the Create new toolholder
button. The toolholder properties dialog box comes up.