Yes, In magento 2 we can create system configuration file same as Magento 1. But we need to create some file. Lets start how to create it

We need to use following file to create it.

app/code/Webmull/Helloworld/etc/adminhtml/system.xml

app/code/Webmull/Helloworld/etc/acl.xml

This 2 files are important to create system configuration.

In System.xml file

Adding the common content

 Now we need to add the Tab

 Add new Section in the file

 Create new group and field on section in file

 So now System.xml file should display like:

Now we need to create acl.xml file

In the file we need to write the below content

After that, Clear the magento cache & logout from admin side. Then Login at admin side. In store >> Configuration you can see the tab “Webmull Extension”. When you click on this you can see the detail of this.

We hope, It will helpful to you.