For those who use crome a lot how do I add and delete rows and columns. With s300 I can just left click and hit add column, can't find the option on crome.

 

it's only optional on the gold rom, and it's not done the same way.
go to Options > Table Properties > change the number of columns.
When you return to the tables, it'll ask you to rebuild tables. default is fine for most, unless your map sensor is huge and you want to scale it down, incremental works best for that.
you'll want to File > Export Tables before you change columns, because it'll usually screw the values up and the only way to keep clean tables is to import them after the change.
you can always double click on a column value and change it if needed. especially for all motor builds that can come in handy.