Custom Product attributes on Import

Hello,

I just purchased your amazing
WooCommerce Orders Tracking – SMS – PayPal Tracking Autopilot
Item URL:
https://codecanyon.net/item/woocommerce-orders-tracking/26062993
Item ID:
26062993

I have a few questions :

1. Can i install the plugin in both my staging and live site?

2. I managed to export my Custom Product attributes such as Article number,Brand,Srcprice,Availabilty How do i import the same back after making changes?
If its custom work let me know cost and time.

Looking forward for your reply,

Regards,

Altaf