Pie charts are unique among the types of graphs Excel can make because they only work with limited sets of data. Unlike bar charts and line charts, two or more pie charts do not combine easily ...

You can combine two columns in Excel using several formulas and tools available in the software. Here's how to combine two columns in Excel.

To merge data in Excel, including two or more columns, use the CONCAT or CONCATENATE formula. If you just need to merge two empty columns together, use Excel's Merge option.