It is much quicker to clone a UCS by domain, by doing
1) "All Configuration" backup of the initial system
2) go through the inital setup script of the new UCS domain, setting IP adress, mask, gwy,.....
3) start UCSM on the new UCS domain, and then do a restore
4) you have to adapt afterwards a few items, e.g. the pools, mgt. IP address,.... to avoid any overlap
There is no embedded method to export and import a SP; of course you could do it, by "show configuration", search and extract this SP, and apply it...