Hello,
You can process/slice the sheet name during import using LabTalk.
See the example below:
string str1$=%(page.info.system.import.filename$);
str1.trimright(".csv");
string str2$=str1.right(10)$;
wks.userparam(++SlicedSheetName);
col(1)[SlicedSheetName]$=str2$;
Best,
Chao