How to add new network adapter to existing hyper-v server

hello guys

now we have win2k8 r2 with installed hyper-v role.

we had a network adapter with 4 ports and these 4 NICs was installed before adding hyper-v role so we select the these 4 NICs when installing the hyper-v role as usual.

after that, we add other new network adapter with 4 NICs.

the problem that we can't see the new 4 NICs in hyper-v manager to create external connection.

any suggestions ??