whether gst levy on activities specify other than schedule 1

Transfer of Goods from Headoffice to Branch office is without consideration , but GST is applicable

I mean two different taxable persons not having same pan no. do activity in exchange of first activity performed without consideration.
both activities not falls in schedule 1.
whether it is considered supply.

In this case sec 15 shall apply in which value of transaction value will be price actually paid for goods or services which is nilso the transaction value is nil and this case no gst will be charged

payment reced. will be not be treated as consideration if there is no direct link between the payment & the supply.

However if there is supply of goods or services in return for the such payment /exchange/barter etc shall treated as consideration for the supply & will be subject to GST

Best example of activities not treated as consideration is : Donation , Grants etc

if both either service rendered or barter of goods not in specify schedule 1. transactions not involves payment of money, then GST is leviable.
my query is that can GST leviable moreover 4 activities specify in schedule 1.
thanx for reply