Using the scp command and so minor setup so you dont get (so you dont get errors)

for starters make sure you have a password set up to do this in terminal just type net user (name of user) * and for linux just use chown or chmod if sudo doesnt work

and then you should be able to use the scp command the syntax is scp Pcname-A@ipaddress:source/directory Pcname-B@ipaddress:destination/directory this should allow you to transfer files over the network

if everything works the sauce pc should respond with a load bar or 100% also if you need further troubleshooting if the scp command is working is if you use the -v after scp (i.e scp -v)

hope this info helps