A grouped report is where one or more fields are used to group the other fields. This will be easier to handle if one field lots of repeating values. As you can display the value once and then display all records that belongs to that group. In order to create such grouped report making use of the report wizard in Access 2016 is the best idea to accomplish this task..
Select the fields you wants to appear on your report, you can select fields from more than one table or query.
For this, you just need to select the table or query using the drop-down list.
Double click the fields in the left pane to shift it across to the right pane. Repeat this for each field which you wish to appear in the report. The fields in the right pane will appear in the report.
Repeat for each relevant table/query. After completing all this, click Next.
You can use several of the reformatting option to make the report look more presentable.
In order to remove the alternating colors, just select the report detail section in design view. After then click Alternate Row Color from the Format tab on the Ribbon, and then select No Color from the contextual menu.
You have to do the same thing for the grouped fields also. In order to select the grouped field, select FieldName Header where fieldname is the name of the grouped field.