Answer:
You can export the nodal support forces by going to File → Export → Tables.
Scroll down and check the box for "Nodes - Support Forces" (Step 1). Click on the text itself to expand the options under the Main tab (Step 2). Make sure the "Select loading" option is activated.
Under the "Load Cases/Combinations" tab (Step 3), select the required combinations and add them to the Selected list (Step 4 and 5).