Please note this is an old forum thread. Information in this post may be out-to-date and/or erroneous.
Every phpdocx version includes new features and improvements. Previously unsupported features may have been added to newer releases, or past issues may have been corrected.
Sorry but there's no support to combine charts. You can change the values of existing charts using replaceChartData, maybe you can use this method to create a custom chart and change its values.