5H have made some handy demo videos showing you how to successfully do a column addition. Enjoy!
260CF175-1ACB-43F6-97D8-8A170422CDA2 CB32C13B-62F0-4956-8DE8-0D4E7BD81CA4 E75C9B22-B29C-41FA-BCC9-59F4475E44A3 AAB19F39-522E-40EC-B22B-C5422A06C851 000FA5CD-4E0C-4E2A-9341-47EAC5B8916D