How to add dynamic-row multi select in system configuration in Magento 2?

Hello, Magento pals,

I hope you are doing great and had a splendid first weekend of 2020. I am back with another interesting and exciting article on Magento 2. Last time, we learned how you can Show Minicart on Custom Popup. Today, we are going to learn how you can add dynamic-row multi-select in system configuration for Magento 2.

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The system configuration is the heart of any extension from where the store owner can handle every functionalities and feature. It enables the Magento developer to scale and meet customer’s requirements.

Till date, we have written several blogs regarding adding different configuration fields in our MageComp Blog. But many times, you came across the requirement of capturing multiple values irrespective of the number of values, at that time we need to use the dynamic field inside backend configuration so the admin can add multiple values using the backend.

To have this facility enabled on your Magento 2 store, we have developed codes. These codes will mitigate the function of adding dynamic-row multiselect in the configuration.

Now, follow the below steps to add dynamic-row multi-select in system configuration:

Step 1: First, we need to create a “Registration.php” file inside our extension on this path.
app\code\Vendor\Extension