Within PTX, the administrator can view your SUNs that you have in the system but you will be unable to edit or add them.
If you were looking to add or edit a SUN, please contact Bottomline Customer Support by dialling +44 (0) 118 925 8250 and choosing option 2 for Technical Support and then option 1 for PTX, HSBC IP Cloud, or Unity EPayments or email emea-support@bottomline.com