Credit Note Different Series

in sales invoice form when i make Sales return i need to make a unique Series for it , to have a different series
Sales invoice series = SINV.###
Sales return Series"Credit Note"= RTN/INV.####


You can create different naming series for sales invoice.Please refer the link to learn more on naming Series.

The first prefix will be the default prefix. If you want the user to explicitly select a series instead of the default one, check the “User must always select” check box.

Hope this helps.

is there any way else to be automatic


Sorry but it is not automated as of now. Please create a github issue for this feature suggestion.