• Go to Masters >> Marg Setups >> Control Room.

• A 'Control Room' window will appear.

• The user will select ‘Search in all’.

• A 'Controls' window will appear in which the user will Search 'Auto Series'.

• Now click on ‘Accept’

• A 'Series' window will appear

• In ‘Auto Multi Series for’ the user will set 'Y'.

• In ‘Series on bases of Party Tin No. / Series Setup’ the user will set 'P'.

• In ‘Default Series for Gst Invoice [Credit]’ the user will set 'T'.

• In ‘Default Series for Gst Invoice [Cash]’ the user will set 'T'.

• In ‘Default Series for Retail Invoice [Credit]’ the user will set 'R'.

• In ‘Default Series for Retail Invoice [Cash]’ the user will set 'R'.

• In ‘Auto series selection only on Sales-S / Sale + Return-R / All-A’ the user will set 'S'.
  

• The user will press 'ESC' key .

• The user will select 'Search In All'.

• A 'Controls' window will appear in which the user will Search 'Invoice Type'.

• Click on 'Accept'.

• In 'Invoice Type Taxable/Retail required in Billing', the user will select 'Y'.

• In 'Un-Registered Dealers bills shift in Retail Billing', the user will select 'Y'.

• The user will now press 'ESC' key twice.
  

• Now click on ‘Yes’ to save changes.

 After following the above steps, the default Series for Tax and Retail in sale Bill will get enabled.

Fig.1 View of Tax Series.