Adding unit to invoice

Adding unit to invoice

Dear Support,

Is there anyway to add a unit field after quantity column? Because our business is a landscape contractor and in certain circumstances we provide soil for example in cubic metres and cannot denote the unit on the invoice. Another example is we supply watering truck and charge per trip. We have a simple solution by adding the unit into the Item description but some clients have been alarmed and asked if we can change this.

Please let me know,

Bent Regards,

Jeffrey