When you say allowances - do you mean a discount? If not, can you provide additional information on what an allowance is used for in your company? 

It is a discount but not a cash discount.  A lot of our customers receive a damage allowance (percentage of the invoice), or freight allowance, etc.  They are all percentages.  The Marketing Director now wants this to be reflected on each invoice.  If it can't be automated, it would be entirely too time consuming to add a line to each invoice.

It is a discount but not a cash discount.  A lot of our customers receive a damage allowance (percentage of the invoice), or freight allowance, etc.  They are all percentages.  The Marketing Director now wants this to be reflected on each invoice.  If it can't be automated, it would be entirely too time consuming to add a line to each invoice.

You could use the discount field on the invoice or if the discount (allowance) is always the same you can add it to AR - Customer Maintenance - Tab #2 Additional - Discount Rate.