A total Roman dominating function on a graph $G$ is a function $f:V(G)\rightarrow \{0,1,2\}$ such that every vertex $v$ with $f(v)=0$ is adjacent to some vertex $u$ with $f(u)=2$, and the subgraph of $G$ induced by the set of all vertices $w$ such that $f(w)>0$ has no isolated vertices. The weight of $f$ is $Σ_{v\in V(G)}f(v)$. The total Roman domination number $γ_{tR}(G)$ is the minimum weight of a total Roman dominating function on $G$. A graph $G$ is $k$-$γ_{tR}$-edge-critical if $γ_{tR}(G+e)<γ_{tR}(G)=k$ for every edge $e\in E(\overline{G})\neq\emptyset $, and $k$-$γ_{tR}$-edge-supercritical if it is $k$-$γ_{tR}$-edge-critical and $γ_{tR}(G+e)=γ_{tR}(G)-2$ for every edge $e\in E(\overline{G})\neq \emptyset $. A graph $G$ is $k$-$γ_{tR}$-edge-stable if $γ_{tR}(G+e)=γ_{tR}(G)=k$ for every edge $e\in E(\overline{G})$ or $E(\overline{G})=\emptyset$. For an edge $e\in E(G)$ incident with a degree $1$ vertex, we define $γ_{tR}(G-e)=\infty$. A graph $G$ is $k$-$γ_{tR}$-edge-removal-critical if $γ_{tR}(G-e)>γ_{tR}(G)=k$ for every edge $e\in E(G)$, and $k$-$γ_{tR}$-edge-removal-supercritical if it is $k$-$γ_{tR}$-edge-removal-critical and $γ_{tR}(G-e)\geqγ_{tR}(G)+2$ for every edge $e\in E(G)$. A graph $G$ is $k$-$γ_{tR}$-edge-removal-stable if $γ_{tR}(G-e)=γ_{tR}(G)=k$ for every edge $e\in E(G)$. We investigate connected $γ_{tR}$-edge-supercritical graphs and exhibit infinite classes of such graphs. In addition, we characterize $γ_{tR}$-edge-removal-critical and $γ_{tR}$-edge-removal-supercritical graphs. Furthermore, we present a connection between $k$-$γ_{tR}$-edge-removal-supercritical and $k$-$γ_{tR}$-edge-stable graphs, and similarly between $k$-$γ_{tR}$-edge-supercritical and $k$-$γ_{tR}$-edge-removal-stable graphs.