Importing data from a comma separated value (CSV) file into one multi-value field.

Overview

Feed Import is a module that allows you to import content into entities from various file types (like XML, HTML, CSV). Sometimes you need to import data for a multivalue field like a multiselect node reference field, or term reference, or any field having multiselect enabled. In that case Feed Tamper allows you to import multivalue field data where that data is delimited by any separator (such as a comma).

Problem Statement
You have one content type having following fields:

• Email
• First Name
• Last Name
• Associated Locations (Multi value Field)

You need to import data for above fields using Feed Imorter where Associated Locations field is multivalued field.

Prepare the CSV

As shown in this picture, location field having multivalue with comma separated.

Configure the Feed Tamper
I assumed you have already enabled the Feed Tamper module. Also enabled Feeds Tamper Admin UI module that would enable Tamper Tab with Feed Importer settings.

When you are doing mapping of your feed importer there is a tab available for Tamper, click on this would found all the mapping fields here.

Look for field_associate_locations and Add plugin for this as shown in screenshot.

Make sure that the string separator is the same as the one you have used in the your csv file. Here we are using comma as a separator.

Ready to upload CSV
Now you are ready to upload your multivalued CSV. Run your importer.