Can I split item lines from sales order while fulfillment?

Hi,

we´re invoicing professional services.

On the sales order we will only have one line with the full volume (sales will not know which consultants may work on a project with how many days / hours) but for invoicing we need to split by consultant to give a meaningful invoice to our customers.

My challenge is that I cannot split the original line of the sales order. If i add additional lines during invoicing I loose track on the overall volume of the sales order.

Example:

Sales Order:

Item line 1: 100 days professional services

Invoice:

item line 1: 10 days professional services consultant 1