How do you choose in textbox for input text in different columns?

i am trying to use a list in textbox for put text in different columns. with a condition about if the text of last column get text, jump to the next column. but i dont know how to get information for the column list number. exist someblock to get this information about number of columns?

Are you using a list or a list of lists ?

i am using only one list for work with my textbox but i dont know how to count and get the column list number for put my text in diferent columns

Please show your relevant blocks, data, etc.