Display a text box based on a check box option?

Hi, I'm trying to find out how to combine text box with an option. For example:

Please select type of additional income:

a) allowance                                  and here I want to insert a textbox, for responder to put an income

b) Bonus                                       and for bonus as well as director fees and others.

c) director fees

d) others

If you want to look at my form, go to Basic salary (PLC/GLC/MNC) question "c"

You can do this by simply setting up a text box and displaying it in view based on the selected option.

Here's an example form I made: https://form.jotformpro.com/71781978994986. Here's how it is setup:

1. I added separate text boxes based on the check box options that you have. 

2. I will then setup conditional logic that will display the text boxes if the check box option is selected. To learn more about the Conditional Logic feature, please do refer to this link: https://www.jotform.com/help/57-Smart-Forms-Using-Conditional-Logic 

Let us know if that will work.