In the Selected Labor & Equipment card click Select Labor & Equipment. The pop-up Select a Labor or Equipment Expense lets you search, sort, filter by category (Labor / Equipment) and set a Quantity and Number of Hours per item; click Save Expenses to add them. Equipment items have no hours field (they count as 1). A line is only kept on save when the quantity is above zero and, for Labor, the number of hours is above zero, so a labor line with 0 hours is dropped. The rate saved is the item's current Rate from Labor & Equipment; the line total is rate x quantity x hours.