Migrating from VSS to VDS with no downtime

hi dear friends

i have 4 dl380g10 and 4  or 3 port group on each of them.PG 1 and 2 are similar but other are diffrent.one PG for vm and mgmt with 2 VMNIC .one PG with 1 vmnic for VMotion .other PG for other use.

1- is it correct that i must create every PG of my VSS in VDS?

2- how should i plan it? others told first migrate some physical NICs then vmkernels if it is right should i first mmigrate one of my mgmt VMNICS?

3-what should i do to avoid losing VDS mgmt when i lose my VC?

thank you