Roxtec Transit Designer - missing transit in the list

Hello I have a question regarding Roxtec Transit Designer. Currently in the project we are considering using H3+1 UG seal. But the problem here is that in the Roxtec Transit Designer solution menu I can only see H3 and H3 UG seals but not the H3+1 UG seal. Is there any option to add it there or did i miss any window/tab where could i have selected it?

Thank you for your answer in advance and wish you a good day.