Hi ,
I am not sure if i understood your question correctly. However from my understanding, you can proceed in this way :
create a new property variable (lets say we a global property named 'UserVar').
Now use one single property transfer to update the value of the 'UserVar' with the first response data (or username).
And this 'UserVar' can be used as input variable across all three following request without any need of any property transfer.
Do let us know, if this helps? Or help us understand your issue correctly
Thanks!
~~ Pradeep Bishnoi ~~