What object?
Are you trying to make a database of items in your game? For example, item "small dagger", requires the player to be level 1. Item "large axe" requires level 9. Item "epic sword" requires level 25, and so on. Is this what you want?
Then you need a separate file for this. And since you are using Construct 3, it's better to choose array file (not text). Right-click on Files, select New -> Array.
You can edit data directly in the table, and store many different stats for your items - damage, price etc.
Here is a small demo:
dropbox.com/s/w82kn9iefrylkr0/ItemsArray.c3p