In order to add a fire-case to the set of loadcombinations, select a exsisting Final stage ULS-combination in order to copy the support and material conditions. Enter a name, combination of loads, set the Limit state to ULS and the Type to Fire. Fire combination can't be dependant of previous cases since the crosssection will change with fire-time.
If you choose [Yes] all values will be copied, if you choose [No] you have to define supports and material for the new load combination. ([Yes] is the recommended selection since it is easier to change exsisting properties rather than adding new ones)
Next step is to go to the Fire-tab and set the properties for the current fire.
