If you are using your printer with KCMYWWVV or KCMYWW inkset, you can specify the white or varnish layer generation method for individual ink channels.

Step 1. In Edit Job > Printer Profile, select Configure White Channels Separately.
Step 2. Select the layer generation method from White Layer Generation 1. Specify the ink density and the position correction if required.
Step 3. Select the layer generation method from White Layer Generation 2. Specify the ink density and the position correction if required.

Follow the same steps to specify the layer generation method for varnish.
Selecting Spot Color from both Layer Generation 1 and Layer Generation 2 will generate the layer with the same method as Off setting.