we have upgraded from Pega 6.2 to Pega 7.2.2, in Data tables we are not able to see edit in excel button please find the respective control "ListEditorDisplay" and the piece of code which is blocking to show the button.
This feature has been replaced in 7.1.7 with the Data Designer.
The data designer has an export to CSV and import from CSV function that removes the excel and ActiveX dependencies making it cross-browser and cross-platform. Excel can still be used to edit the CSV files if you like but it is not required.
Note: Data tables are superseded by the local data storage feature. Click Convert for each data table displayed on this landing page to convert it to the new format.
To create local data storage for data types, select the data type in the Data Explorer.