QB Issue Resolution:

QBO does not have progress invoicing, you would have to create two invoices, one for each amount with different dates

there is no line item discount in QBO, but the whole invoice can be discounted, Click the gear >settings> Sales Form, click discounts, check mark the box for discounts

Resolution for Issue 'I need to be able to bill for 1/2 the amount of an invoice. I also need to be able to add a discount in an invoice. Help?' available: Yes (Solved).
Source: Intuit Community forum.

I need to be able to bill for 1/2 the amount of an invoice. I also need to be able to add a discount in an invoice. Help?: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

Support for Invoice
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