Divide the limit of a table

[tanias]

Hi there! I need some help!

Well, I have a table with some columns inside of others. I wanna know how can I divide the limit, the line of limit of three columns. I'm not sure if I can explain what I want. I don't wanna divide the columns, it's done. I wanna make some spaces in the line limit that divides the row.



Can you help me?

Thank you in advance!