How can I create a project in codeblocks with the existing source code?

How can I create a project in codeblocks when the source code already exists ??

1. Create a project

2. Add files.

Specifically: Put the source file in the project directory in step 1 and add it to the project.

How do I set command line parameters?

Project-> set program's arguments.

How to use a ready-made makefile ??

1) "file-> New-> Project", select "Empty Project", and create a project.
2) Right-click the project and select "add files" to add C/C ++ and head files to the project.
3) Select a project, right-click the project, select "properties", and set "makefile" in the "Project Settings" tab to the MAKEFILE file name, and select "this is a custom makefile ".
4) Right-click the project, select "build options", and delete all "$ target" on the "make" command "tab ".

How can I create a project in codeblocks with the existing source code?