I want to move from generating manual invoices to e-invoices. What is the process?

To move from generating manual invoices to Einvoice you need to ensure that 
 your turnover exceed 5 crores in preceeding financial year then you have to eligible 
 your GSTIN number from Einvoice portal to enable E invoice .
 To configure E invoice in BUSY you should have standard or enterprise model and latest version and release of BUSY and follow the steps 
 Step1 Go to administration menu and click on configuration then click to feature 
 options 
 Step2 click on GST VAT option and enable required E invoice option and configure 
 your location and pincode 
 Step3 create a GSP ID and password through Ewaybill or Einvoice portal 
 Step4 Click on GSP configuration Under GST VAT optionand select the GSP which 
 you have created from portal 
 Step5 mention the GSP user ID and password on the specific GSP Field and validate then press OK and save 
 Step6 Go to administration menu and click to configuration then click on voucher 
 series configuration then select sale voucher type and its series and click to voucher 
 configuration and enable Input transport details option and Generate einvoice after saving option and save 
 Step7 then create voucher as usual from BUSY and after saving when the transport details box will open enable Einvoice there and save 
 Step8 click on yes to generate einvoice on einvoice generation option 
 Step9 Remove the errors and generate Einvoice