This is an example of how you can use “Bitwise Numbers”, a tilemap and an array in Construct 2 to automatically tile a level for you.
The example is based on my old Construct Classic tutorial which can be found on my old tutorials blog HERE and is based on a wonderful post by Salt on his blog. I recommend giving the blog post a read before opening the .capx as it explains the basics really well.
You can try the HTML5 Demo.
Use left click to place a tile, right click to remove, hold shift & left mouse button and drag to tile a rectangular area.