Using T$-$SQL in VS $2022,$ provide code for the following, please include details for understanding of what the line of code does. Thank you:

Declare a variable called @SupplierId and assign the value of $4.$ Then display the supplier name and address of that supplier. Followed by the supplier's delivery history with name $=,$ product name, and total value $($QuntityXPrice$)$ of that delivery.