Hi Dave,

A sub-domain will be regarded as another Site, so you would need to do the same 'process' as if you were moving the Plugin data like tables/charts, etc from Site A to Site B.

Here are more details :

When you are moving the Plugin's data from one Site to another, we can suggest using Plugin Duplicator. We use it and it's working fine because it will transfer all the files and also the tables to the database. 

Other than cloning the site, another option would be to copy all database tables (wp_wpdatatable_#) along with tables wp_wpdatatables, wp_wpdatacharts, wp_wpdatatables_rows and wp_wpdatatables_columns. Then, in wp_options table, you would also need to export the following option_names:

• wdtPreventDeletingTables
• wdtUseSeparateCon
• wdtSeparateCon
• wdtTimepickerRange
• wdtTimeFormat
• wdtTabletWidth
• wdtTablesPerPage
• wdtSumFunctionsLabel
• wdtRenderFilter
• wdtRenderCharts
• wdtIncludeBootstrap
• wdtIncludeBootstrapBackEnd
• wdtPreventDeletingTables
• wdtParseShortcodes
• wdtNumbersAlign
• wdtBorderRemoval
• wdtBorderRemovalHeader
• wdtNumberFormat
• wdtMobileWidth
• wdtMinifiedJs
• wdtMinFunctionsLabel
• wdtMaxFunctionsLabel
• wdtLeftOffset
• wdtTopOffset
• wdtInterfaceLanguage
• wdtGeneratedTablesCount
• wdtFontColorSettings
• wdtDecimalPlaces
• wdtCSVDelimiter
• wdtDateFormat
• wdtCustomJs
• wdtCustomCss
• wdtBaseSkin
• wdtAvgFunctionsLabel
• wdtInstallDate
• wdtRatingDiv
• wdtMDNewsDiv
• wdtTempFutureDate

It is rather cumbersome to do all this, but unfortunately at the moment, it's the only way. 

Important to note, for tables linked to an existing data source, you would need to change the file path, because at the moment the file path depends on the domain, so if you change the domain, the URL to the file will also have to be changed.

Our developers will be working on adding an easier solution to export everything, but we can't say an ETA on this.

- There are also certain export functionalities, to export individual tables using Table Tools.

I hope that helps.