hi Jocelyn,
if you put your {TimeLogs.TotalTime} field on your report, right click on it and choose Insert > Summary and then leave it as type = Sum and then have it inserted on the desired group level.
now right click on the new Summary and choose Format Field > Common tab > Display string and enter this syntax
numbervar ts:= currentfieldvalue;
totext(dateadd("s",ts,currentdate),'HH:mm:ss');
for the second question please post a new discussion as per the forum rules.
-jamie