How do you manage your goods-amount only orders?

Summary:

the documentation only shows the following item type categories:

Need a category for goods billed by amount only - for example, if there is a big ticket item where there is a schedule of payment like: 10% upon order, 60% upon delivery and 30% after installation and inspection. would like to be able to process this order in the manner outlined above where there is a 2-way matching of invoices at every step.

Content (required):

end user would like to have capability to have a 2-way match on a goods billed by amount only as outlined above.

Version (include the version you are using, if applicable):