This video tutorial shows how to create a generic save and load system, easy to integrate into your own game. Use CSS to add some styling & with support for saving extra attributes to preview saved games.
You can download the template here : https://www.construct.net/en/game-assets/game-templates/generic-save-dialog-99
Contact me on Fiverr if you want further assistance :
https://www.fiverr.com/bartalluyn/assist-you-in-creating-your-construct-3-project