You need to add a formula to your category names on your spreadsheet, similiar to the example I have posted.
Pie Chart
<TABLE style="BACKGROUND-COLOR: #ffffff; PADDING-LEFT: 2pt; PADDING-RIGHT: 2pt; FONT-FAMILY: Calibri,Arial; FONT-SIZE: 11pt" border=1 cellSpacing=0 cellPadding=0><COLGROUP><COL style="WIDTH: 30px; FONT-WEIGHT: bold"><COL style="WIDTH: 76px"><COL style="WIDTH: 44px"></COLGROUP><TBODY><TR style="TEXT-ALIGN: center; BACKGROUND-COLOR: #cacaca; FONT-SIZE: 8pt; FONT-WEIGHT: bold"><TD> </TD><TD>A</TD><TD>B</TD></TR><TR style="HEIGHT: 18px"><TD style="TEXT-ALIGN: center; BACKGROUND-COLOR: #cacaca; FONT-SIZE: 8pt">1</TD><TD style="TEXT-ALIGN: center; BACKGROUND-COLOR: #c0c0c0">Month</TD><TD style="TEXT-ALIGN: center; BACKGROUND-COLOR: #c0c0c0">Data</TD></TR><TR style="HEIGHT: 18px"><TD style="TEXT-ALIGN: center; BACKGROUND-COLOR: #cacaca; FONT-SIZE: 8pt">2</TD><TD style="TEXT-ALIGN: center">January</TD><TD style="TEXT-ALIGN: right">908</TD></TR><TR style="HEIGHT: 18px"><TD style="TEXT-ALIGN: center; BACKGROUND-COLOR: #cacaca; FONT-SIZE: 8pt">3</TD><TD style="TEXT-ALIGN: center">February</TD><TD style="TEXT-ALIGN: right">290</TD></TR><TR style="HEIGHT: 18px"><TD style="TEXT-ALIGN: center; BACKGROUND-COLOR: #cacaca; FONT-SIZE: 8pt">4</TD><TD style="TEXT-ALIGN: center">March</TD><TD style="TEXT-ALIGN: right">160</TD></TR><TR style="HEIGHT: 18px"><TD style="TEXT-ALIGN: center; BACKGROUND-COLOR: #cacaca; FONT-SIZE: 8pt">5</TD><TD style="TEXT-ALIGN: center">April</TD><TD style="TEXT-ALIGN: right">289</TD></TR><TR style="HEIGHT: 18px"><TD style="TEXT-ALIGN: center; BACKGROUND-COLOR: #cacaca; FONT-SIZE: 8pt">6</TD><TD> </TD><TD style="TEXT-ALIGN: right">0</TD></TR><TR style="HEIGHT: 18px"><TD style="TEXT-ALIGN: center; BACKGROUND-COLOR: #cacaca; FONT-SIZE: 8pt">7</TD><TD style="TEXT-ALIGN: center">June</TD><TD style="TEXT-ALIGN: right">949</TD></TR><TR style="HEIGHT: 18px"><TD style="TEXT-ALIGN: center; BACKGROUND-COLOR: #cacaca; FONT-SIZE: 8pt">8</TD><TD style="TEXT-ALIGN: center">July</TD><TD style="TEXT-ALIGN: right">242</TD></TR><TR style="HEIGHT: 18px"><TD style="TEXT-ALIGN: center; BACKGROUND-COLOR: #cacaca; FONT-SIZE: 8pt">9</TD><TD style="TEXT-ALIGN: center">August</TD><TD style="TEXT-ALIGN: right">802</TD></TR><TR style="HEIGHT: 18px"><TD style="TEXT-ALIGN: center; BACKGROUND-COLOR: #cacaca; FONT-SIZE: 8pt">10</TD><TD> </TD><TD style="TEXT-ALIGN: right">0</TD></TR><TR style="HEIGHT: 18px"><TD style="TEXT-ALIGN: center; BACKGROUND-COLOR: #cacaca; FONT-SIZE: 8pt">11</TD><TD style="TEXT-ALIGN: center">October</TD><TD style="TEXT-ALIGN: right">266</TD></TR><TR style="HEIGHT: 18px"><TD style="TEXT-ALIGN: center; BACKGROUND-COLOR: #cacaca; FONT-SIZE: 8pt">12</TD><TD style="TEXT-ALIGN: center">November</TD><TD style="TEXT-ALIGN: right">705</TD></TR><TR style="HEIGHT: 18px"><TD style="TEXT-ALIGN: center; BACKGROUND-COLOR: #cacaca; FONT-SIZE: 8pt">13</TD><TD style="TEXT-ALIGN: center">December</TD><TD style="TEXT-ALIGN: right">239</TD></TR></TBODY></TABLE>
<TABLE style="BORDER-BOTTOM-STYLE: groove; BORDER-BOTTOM-COLOR: #00ff00; BORDER-RIGHT-STYLE: groove; BACKGROUND-COLOR: #fffcf9; BORDER-TOP-COLOR: #00ff00; FONT-FAMILY: Arial; BORDER-TOP-STYLE: groove; COLOR: #000000; BORDER-RIGHT-COLOR: #00ff00; FONT-SIZE: 10pt; BORDER-LEFT-STYLE: groove; BORDER-LEFT-COLOR: #00ff00"><TBODY><TR><TD>
Spreadsheet Formulas</TD></TR><TR><TD><TABLE style="FONT-FAMILY: Arial; FONT-SIZE: 9pt" border=1 cellSpacing=0 cellPadding=2><TBODY><TR style="BACKGROUND-COLOR: #cacaca; FONT-SIZE: 10pt"><TD>Cell</TD><TD>Formula</TD></TR><TR><TD>A2</TD><TD>=IF(B2>0,"January","")</TD></TR><TR><TD>A3</TD><TD>=IF(B3>0,"February","")</TD></TR><TR><TD>A4</TD><TD>=IF(B4>0,"March","")</TD></TR><TR><TD>A5</TD><TD>=IF(B5>0,"April","")</TD></TR><TR><TD>A6</TD><TD>=IF(B6>0,"May","")</TD></TR><TR><TD>A7</TD><TD>=IF(B7>0,"June","")</TD></TR><TR><TD>A8</TD><TD>=IF(B8>0,"July","")</TD></TR><TR><TD>A9</TD><TD>=IF(B9>0,"August","")</TD></TR><TR><TD>A10</TD><TD>=IF(B10>0,"September","")</TD></TR><TR><TD>A11</TD><TD>=IF(B11>0,"October","")</TD></TR><TR><TD>A12</TD><TD>=IF(B12>0,"November","")</TD></TR><TR><TD>A13</TD><TD>=IF(B13>0,"December","")</TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE>
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Jason