Hello Bruce,

Before going through the procedure, it is required to make some changes in the SALES module.

• Navigate to SALES -> Settings

• Products Section---

• Units of measure -> Select (Some products may be sold/purchased in different units of measure (advanced))

• Default Invoicing  -> Select (Invoice delivered quantities)

• Pricing Section---

• Sale Price -> Select (Advanced pricing based on formulas (discounts, margins, rounding))

After making the above changes, Save it or Apply.

• Create one Service PRODUCT from the sales module. Set Sale & Cost price.

• Under Invoicing Section -> Invoicing Policy

• Invoicing Policy -> Select (Delivered quantities)
  

• Track Service -> Select (Create a task and track hours)

• Project -> Select the existing project or create and edit the project on the go
  

• Make sure that when you create project the Allow Timesheet option is ticked

Save the Product and navigate to Quotation in Sales module.

• Create the new Quotation, set the Customer  and add the Service Product that you just created

• Set the order quantity and Save

• Click CONFIRM SALE and you will see the new task icn on the right top corner. click on the Task icon and you can fill the timesheet entry from there
  

• Or the employee can navigate to Project -> Task -> Edit and fill the timesheet and save
  

Once the hours has been filled and the task is completed, navigate to SALES -> Quotations -> Select the previously created Quotation number -> and now you can see the total price with tax (if applied)

Click Create Invoice and the INVOICE will be generated for the desired Customer.

This is how the project hours can be billed. Hope this answers your query.

Thanks