Multipliers and Total Multiplier Effect

Hello, I am modeling the economic contributions of film-making on a County and then separately I will be modeling the impacts of new tourism on that same county that is generated by producing the film in that location. When I am reporting the total multiplier effect, would it be appropriate for me to sum the multipliers from both scenarios (the economic effects of film-making plus the impacts of new tourism), or would it be more appropriate to report the multipliers of each scenario separately? Also, I understand that the size of the multiplier depends on how money is spent in the industries of my Study Region (and therefore it varies depending on the industries under analysis), but should I be suspicious if my multipliers are over 4.0? Thank you very much! Andrew