# Java 8, <s>158</s> 118 bytes

This is just a start, but hey, FGITWFTW. 

<pre><code>n->{String o="";int z=n.lastIndexOf("-"),i=z;for(;i-->0;o+="/\n")for(int y=i;y-->0;o+=" ");return o+n.substring(z+2);}</code></pre>

Expects input as a string, returns the box.