Top and bottom views always contain all the reinforcement bars that were created for the viewed formwork. In order to separate the upper and lower bar fields in the slab you need to define 2 new views.
The command you need is "Create a new reinforcement section", available in the "AC:Drawing", in the "Others" tab.
In order to define the section cut plane and depth you need an elevation or left/right cut
of the slab within the reinforcement drawing, where the correspondent bar field distributions are visible.
For the top bar field, apply the command and build the section line, in the elevation, above the slab formwork. When you are asked to define the section back plane, go under the top bar field, but do not include the bottom bar field. After you finish defining the section, you will be asked to place the new view in the drawing by selecting a point in the workspace.
For the bottom bar field, you will create a new section view. Build the section line below the slab formwork and for the section back plane, go above the bottom bar field, but do not include the top bar field.
If you want to remove a view from the reinforcement drawing, you can use the "Delete a reinforcement view" command, which is available in the same tab of the "AC:Drawing" ribbon. After initializing the command you need to make a selection of all the formwork and reinforcement elements of the view you want to remove. To finish the command, press the "Enter" key.
If you have any other questions, please don't hesitate to contact us.