What is the Versus symbol? I've never really studied math, but was wondering, is there a designated symbol used for implying "versus", or would you just write "Vs."? For example, I'm working on a calculation like this: Cost expense A "versus" cost expense B + cost expense C + cost expense D - Expense E = Total 1 vs Total 2

There is no commonly used symbol for versus of which I'm aware. What you're asking for seems closest to some usage of the exclusive OR symbol (i.e XOR, $\oplus$), but I don't think that works here, as you seem to be looking for one number or the other, not a logical output.

You could use a vector equation to have both numbers present

\begin{align} \begin{pmatrix} A \\\ B \end{pmatrix} + C + D - E = \begin{pmatrix} T_A \\\ T_B \end{pmatrix} \end{align}

where it is implied that $C,D,E$ are multiplied by $\begin{pmatrix}1\\\1\end{pmatrix}$ and where $T_A,T_B$ represent the totals in either scenario.