For each model, it have color attribute and in booking form, you need display color option for the client choose for their device. To create model color and assign to model, please follows:
After create a model color, if you want to edit or delete a color, please hover mouse on item. The 'edit' or the 'delete' icon will appear in top right corner of item. Please click 'edit' icon if you want edit, or 'delete' icon if want delete