It’s up to you which you use to qualify for the next visa... you can chose whether to use your savings again, your employment income, or a mixture of both if you can’t qualify for one or the other individually.
The easiest way to qualify is to use savings again... so if you can keep at least £62,500 available in savings for the next 2.5 years, then you can just submit 6 months of bank statements again and be done with it.
If you don’t have the £62,500 savings available anymore or you would prefer to use employment, you can use employment income, under either Category A or B, depending on your employment circumstances, but it involves more paperwork (payslips, bank statements, employer letter, P60, job contract - and they have to have minimum figures on each payslip, the bank statements have to match the payslips, and all the documents must be in specific formats) than just using savings.
Or if your savings has gone below £62,500, or you don’t earn at least £18,600, you can combine it with your income to meet the requirement, which means providing ALL the documents listed above, both for savings and for employment.
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