Custom Pricing enables you to capture ad hoc product quantities and pricing without having to create a permanent Product.
Steps
Starting from the Takeoff and Estimate screen, tap on the Summary tab
Tap the + Add Other Items button
Tap Add Custom Pricing
Fill in the details and tap the OK button to close.
The product information collected will appear in the Custom Pricing Items section within the Summary screen and can appear on output documents depending on how you have your output templates configured.