Need help regarding dispatch/stock transfer from one manu unit to other manu unit (same gstin)

We have one manufacturing UNIT 1 which process the raw leahter to finished leather, transfer item to UNIT 2, where UNIT 2 process the finished leather to belt, shoes etc

P-1. Now as per E Way Bill provision, what we need to do, Dispatch of goods or Transfer of Goods (mark relevent provisiob please). Both UNIT GSTIN is same.

P-2 Are there any Govt Defined format avaiable?

P-3 When I transfer/deliver from UNIT 1 to UNIT 2, Whta is the rate of the transfer and should I need to show the SGST & CGST in this transfer where transfer between same GSTIN

Please help me to understand and if there are any link availble please provide