Hi
Yes, this is possible. Do the following to achive desired format
1. Insert a group on Id number
2. create following formulas to add or concatenate activity's
Create and place in id number group header and suppress
Whileprintingrecords;
stringvar act:=' '
Create and place in detail section and suppress
Whileprintingrecords;
stringvar act;
act:=act+{activity};
Create and place in id number group footer
Whileprintingrecords;
stringvar act;
Now suppress group header and detail sections and place id number, name, the 3rd formula in your group footer.