Whatsapp has multi-machine support that allows users to use their accounts on multiple devices.
It allows you to use Whatsapp accounts on up to four devices and only one smartphone.
This means users cannot use one account on multiple smartphones.

This feature is spotted on the beta version of the Android 2.22.10.13 update.
Currently, the feature is under development, and its not clear when this feature will arrive.
It has also shared a screenshot that shows the interface while opening the app on a second mobile unit.

Theres a Register machine as Companion section it gives an idea of what the feature might look like.
The new feature is called a companion gadget.
After that, users can access an account by scanning a QR code using their primary smartphone.

The screenshots show that WhatsApp will call the new feature a companion rig.
Heres how this will work.
So, let us see how does the current multi-rig feature works.

Firstly, you will need your phone to link the Whatsapp account to multiple devices.
Then you could use the app without a smartphone.
For that, open Whatsapp, and choose the three-dotted icon at the top right corner of the screen.
It will show the Linked devices option.
You must press it and tap again on the Linked a gear option.