Expanding my list for the chart....

Hi,

recently you have helped me with a particular spreadsheet (atatched). B1 only goes from Q1.1 to Q1.6. If I want to expand that how do I do it? I want to start to expand it to go to 2.1,2.2 etc. I can't seem to find where that list is configured.

Could someone please let me know?

Thank you.

Mark