The styles for the node or beam labels can be controlled from within the top menu View > Options.There is limited option to have the node and beam labels in an alphanumeric form. For example nodes can be labeled as N1, N2 etc but it cannot be labeled as A1, B1 etc. Similarly beams can be labeled as E1, E2 and not as per any user defined numbering scheme. Also please note that these are just labels which are displayed in the GUI and these labels do not affect the joint coordinates or the member incidences data.
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