Off topic:split text file in multiples text files

Question

[ulises.rodriguez]

Hello, I Have a file text that looks like this

number1.1   characters_string_1
number1.2   characters_string_2
number1.3   characters_string_3

number2.1   characters_string_1
number2.2   characters_string_2
number2.3   characters_string_3

number3.1   characters_string_1
number3.2   characters_string_2
number3.3   characters_string_3

and I would like to split this text file in multiple text files