Exporting and Importing Themes 
You use the Theme Archive tool to import and export themes as zip files.
Choose .
Your themes are listed under Export Themes.
To export a theme, click the theme to be exported and specify a target folder for the zip file.
To import a theme:
Specify the path to the theme that you want to import, or choose Browse to select the zip file of a theme.
If you want the imported theme to overwrite existing themes, select Overwrite Existing Theme.
Choose Import.
Recommendation
When themes are imported, the portal automatically reloads, upgrades, if necessary, generates, and saves the themes in the PCD and in the file system. This process also happens when the portal or the design service restarts. If a restart is planned, you can save the time required for this process during import by changing value of the following property in the design service to false:
Service — designservicepcdnotification under portal component com.sap.portal.themes.designservicenotificationservice
Property — Generate_Imported_Themes
Go to .
In the Detailed Navigation panel, choose Service Configuration.
In the Portal Catalog, expand the Applications node and find the service com.sap.portal.appintegrator.
Expand the Services node and in the context menu of Common_Configuration, choose Configure. This opens the Property editor of the service.
Edit the Generate_Imported_Themes property as required.