Simple problem but tricky- Groupings

Hello Christopher ChrisAvak 

I am attaching a file with quite a few tricks and fantasy in case you find it useful for your query...

I have assigned the 24H Calendar to the project, to schedule activities any day of the year.
I have left the Currency Symbol blank, with 0 decimal places in Project Options > Display, because I am using the field Cost = Activity Assigned Units x 1(Standard Rate of Resource "Activity"). to count the activities.
Items are always supposed to last only 1 day (=Default duration)
I have created two resources: Activity1 and Activity2 of Material Type, with label=Units and Standard Rate=1, in the Resource Sheet view.

You must use the " Data Entry" view to add Items by typing in the Task Name column.
Then assign Activity 1 and Activity 2 with the corresponding Units, by double-clicking on the task > Resources tab, or right-clicking on the task, or in View > Split view > Details, ... for example.

Use the " Activity Report by Date" view to display the totals for each activity.

If you change a date of the activity in that view you have to reload the view to update results.

If you want to hide the items in this results view, you can select: Menu > Data > Show Outline > Level 2 (or manually hide in the outline).

In this view, grouping called " Activity Grouping by Date" is applied to calculate the totals in the Cost column.

N.- If an activity is carried out on more than 1 date for the same Item, in the Data Entry view, a new task must be created with that Item, assigning the corresponding Activity resource, along with the Units and the Date on which It has been made.

N.- If you want, you can change the title displayed in the Cost column of the " Activity Report by Date" view, by selecting with the right mouse button on the title > Field Settings...

I hope I've helped.

Ignacio