# Steps to Design (Variables, Array, Structure)

You can learn how to design Variables, Arrays, and Structures in this section.

- Add Variable
- Add Array
- Add Structure

Create a DINT (External) and String (Internal) variables in [All Variables].

Note:

- To organize variables, you can create up to 100 folders below the [All Variable] node.

- To create folders, in the Project Explorer select [All Variables] and click the [Folder] button. You can then create variables in the folder.
- Once a variable is created in a folder, you cannot move the variable to another folder.
- You cannot use the same name between the variable and folder.

Create a WORD Array and DINT Array (3-Dimension) data types in [Array].

Create a Structure in [Structure].