Hi,
For the moment the best is to duplicate (to copy) the collect on delivery plugin but with HikaShop 2.2.0 (the next version) it would be possible to have multiple configuration for each payment and shipping methods (like the "manual shipping" does).
So, there will be a way to use the "collect on delivery" plugin more than once, in the next version.
Regards,
Jerome - Obsidev.com
HikaMarket & HikaSerial developer / HikaShop core dev team.
Also helping the HikaShop support team when having some time or couldn't sleep.
By the way, do not send me private message, use the "contact us" form instead.