Bulk actions let you specify markups, discounts, and other attributes to select line items.

Start by ticking the ☑️ checkbox next to each line item you want to change, and you'll notice the cog on the toolbar become available.
Click the ⚙ cog and select the action you want to apply:

You can select all items in a section by ticking the checkbox below the section title.

See this article for information on combining to one line.

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