The Combine option allows you to mix various input fields into one output field.
You can involve conditions for each combination. You can likewise consolidate fields for certain items, and utilize a single field for the others.
To use the COMBINE option, follow the steps below:
Scroll down to find the field you want to map.
From the first drop-down list next to it, Select Combine.
In the next field select as many Input Fields that you want to combine into one field.
Type in the separator you'd want between the values (e.g. comma).
A good use is when your source has two separate fields - weight major (e.g 5) and a weight major unit (e.g inch), and you want to combine them into one weight field on the output feed. In this example, the output will be "5 inch. (use "SPACE" as the separator).