If you have other create other benefits except basic salary and deductions to calculate payroll, you can create them in Better HR.

1). Go to 'Setting' and click on 'Payroll'.

To add benefits and allowances -

1 ). When you are in this view, you can add your benefits by clicking on '+Create Custom Benefits'.

2). Type benefit name and click 'Create'.

To add deductions -

1 ). You can add deductions by clicking on '+Create Custom Deductions', under 'Allowances'.

2). Type deduction name and click 'Create'.

You can refer as per following video: