Generation of Streams are based on the Xena Test modules, please refer to below link which gives details about the Number of transmit streams per port.
I am using an M2SFP+ module, where I will have the provision to create a Max of 256 streams per port.
From the ValkyrieManager GUI -> Module 3 M2SFP+ -> Right click on Port 0 to add multiple streams.
Define the number of streams required (in our case it is 65)
Go to Stream configuration grid to to define Unique Src Mac, Dst Mac and Same VLAN ID