how can i convert .sas7bcat format file to .sas7bdat?
SAS7BCAT are catalogs, not data sets. So you can't convert SAS7BCAT to SAS7BDAT.
In general you cannot. Whether you can do anything or not depends on what types of member are in the catalog. So the first thing to do is see what is in the catalog.
https://documentation.sas.com/doc/en/pgmsascdc/9.4_3.5/proc/p098gxyhcmikjdn134dvlhryd4ju.htm
If the catalog just contains format definitions then you can convert those to a dataset using PROC FORMAT.
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