Can i configure router behind router? and another question..

we have 3 places:

1. ESX server, the VMs in this ESX receives Native IPv6 (/64) with router advertisment.

2. ESX server without Native IPv6, i connected it to HE.

3. office, not connected to IPv6

Two questions:

1. on the first place, i receive native /64 router advertisment. can i route part of this /64, for example /120, to another place (via 6 in 4 tunnel)?

2. on the second place, i receive /64 from Hurricane Electric and did routing with the "route" network. for example - the HE "route" network is 2001:AAA:BBBB:CCCC::1/64. i want to add router at 2001:AAA:BBBB:CCCC:B0:1/80 and "move" this prefix to another place, can i do that? if not, can i do that in the router that connected to HE, route two sub prefixes to two places?


I am working with debian.

Thank you!