I created a subreport that included a total by group.  I also have total by group in the main report.  How do I combine the total from the subreport to the main report total?

How do I do that?  It is also grouped by date.

The shared variable needs to be created in both the Subreport and the main report. You will declare the value of the variable in the subreport:

whileprintingrecords;
shared numbervar nTotal:=(the total by group field);

And you will display the value in the main report:

whileprintingrecords;
shared numbervar nTotal;

To get the subreport to run properly for the group, you will need to devise a way to get the subreport to only run for that group date. To achieve this, I believe you will have to create another shared variable that takes the date of the group from the main report and passes it to the subreport. The subreport should then use this date in the Record Selection Formulas. This will limit the subreport to run only for the current group date.

Something to remember. The shared date variable from the main report needs to be calculated before the subreport. So you will probably need to place it in the Group Header.

Also, the Subreport needs to be run in a section before you can use the shared variable that comes from it. For this, you may need to have a Group Footer A and Group Footer B. The subreport would be put in A and the combined total would be put in B.