My assumption is that you refer to the RC Spread Footing design module. These combinations are automatically generated. In fact Robot generates two sets of them; one for RC part design and one for 'geotechnical' part (sizing of a foundation).
EC7_04_A1 refer to the A1 set from the table A.3 from Appendix A
EC7_04_A2 to A2
In the geotechnical options the 220.127.116.11.4 approach is selected.
If you find your post answered press the Accept as Solution button please. This will help other users to find solutions much faster. Thank you.