Hello Anant
There is already a pre-delivered depreciation method IN33 for 45% declining balance and also the depreciation method IN43,INDPM210 for 19.8%. Can you check if you can use these depreciation method rather than creating new ones? You can more details in the help document "Depreciation Methods — India"
If you still want to create new depreciation method, then you need to choose the template based on the other characteristics like Period Control Method, Depreciation Start Date,End of Planned Depreciation, Salvage Value Handling.
You can get more details about these templates in the help center document "Configuration: Depreciation Methods".
Thanks
Parveen Kumar