Summing a column of numbers on a Bookmap screen

[avalo]

It would be useful to be able to take a column of numbers on a Bookmap screen and add them together to provide a total. There would be many areas where such a function would be useful, e.g., summing COB columns or delta for bid vs ask data.  If I can assist, please do not hesitate to contact me at tscleary@gmail.com