So there is no ready column to just show labor cost? (for the costs obtained from the labor resources i entered in the resource sheet and then asigned to activities i mean)

also, when i do this calculation using fixed cost, it works because cost column alrady takes fixed cost column into account. however when i made another cost column for another type of cost, say cost1, and said labor = cost -cost1, this time when i add something into cost1, labor cost decreased. because "cost" column wasnt taking cost1 into account and i had said labor = cost - cost1. how can i tell ms project that the cost column also needs to include cost1 column?