How to export jasper report to an existing excel file - jasper-reports

I have an jasper report that I can easily export as an .xls (using preview function in jasper). However I want Jasper to export to an existing excel file (say in my desktop "~/Desktop/output.xls )
I think its something related to Interface XlsExporterConfiguration but I am not sure how or what to do. I'd like to do something like:
Start Jaspersoft Studio IDE.
Open JRXML file.
Run JRXML file to generate (preview) a report.
Click File >> Export >> Append to append report to an existing spreadsheet.
The File >> Export >> Append isn't how to do this from within the IDE. Is there a way?

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LibreOffice --convert-to pdf

After upgrade LibreOffice to version: LibreOffice 5.2.5.1 20m0(Build:1), i have next error. After converting xlsx file to pdf with command
soffice --headless --convert-to pdf:calc_pdf_Export test.xlsx
Generated PDF file not contain any calculated values, why?? Version LibreOffice 5.1.6.2 10m0(Build:2) works fine. In original xlsx file all formulas calculated fine.
UPDATE:
I'am try change (in my test machine) Tools->Options->LibreOffice Calc->Formula->Recalculation on file load to "Always" and then run convert, works fine, but if selected "Newer/Ask User", formulas not calculated in pdf. How i can change this values without GUI on server? ..

JasperReport exporting to xlsx format works fine with java code but not with jasperserver

I am working on a complex report structure with jasper report studio. Everything was fine until I publish the report on jasper server. I am not getting the same output when exporting to xlsx format.
This is the xlsx format generated by JRXlsxExporter class
And this what i am getting from jasper server export to xlsx format
After setting the property collapseRowSpan to false of the bean xlsExportParameters declared in the /jasperreports-server-cp-6.3.0/apache-tomcat/webapps/jasperserver/WEB-INFapplicationContext.xml file the xlsx export works fine just like expected.

JasperSoft Studio 5.6.1 Excel Macro Merge Template

I am attempting to merge an excel exported file from Jaspersoft Studio 5.6.1 with a macro-enabled excel file. However, when I use the "Add JasperReports Server Resource", other file types are not permitted. What is the proper procedure for uploading macro.xls?
Is the macro file needed in the local studio folder structure and get compiled together with the .jrxml OR does it exist on the JasperServer as a resource that is retrieved when the report is executed? This is a requirement for us in order to produce a file with grouped/collapsed columns which is not supported by the native API's.
When I place the macro file on the JasperReports Server and provide the path in the properties of the report, I receive an error message:
net.sf.jasperreports.engine.JRException: Input stream not found at : /Folder/Resources/macro.xlt

iReport CSV preview - where does the CSV get saved?

I'm running iReport on ubuntu. When I choose the CSV preview from the Build menu and choose Build -> execute (with active connection) a message is displayed in the console saying "Exporting Report". But nothing happens afterwards. Where does the CSV file get saved?
PS:- When choosing JRViewer preview things work fine
The files were in the bin directory of the root iReport directory.

how to create duplicate report on a same server

My manager asked me to update the .rdl file from prod to dev. But before doing that I have to keep that old report as it is and have to create a duplicate report on same server and that too be I am working on browser.
I have downloaded the the .rdl file and renamed the report as *_old also. But I am not able to understand how to create another same report with same datasources and everything.
I can see an option update next to edit button. I am assuming that if I get a duplicate report on the same server I can update the .rdl file with that update button.
Please help me with this problem.
- Download the report RDL file from the report manager.
- Rename the rdl file eg. MyReport1_old.rdl
- Upload the report rdl file from the report manager.
Now you will have the original report (MyReport1) and the copy of it(MyReport1_old).