No-charge on Time Entries: In LeanLaw, when creating or editing a time entry, you have the choice between Billable or Non-Billable. Flipping the entry to Non-Billable will still track the time, but won't charge the client.
Discount the Invoice: QuickBooks Online
In QuickBooks, you can show discount (percent or $ value) after subtotal.
You will first need to change discount setting on under Sales form content.
From the homepage screen, go the company gear (located top upper corner)
Select Company Settings
Select Sales under Settings
Select Discount ON under Sales form content heading
To discount individual line items in your QuickBooks Invoice, follow the guide posted here.