You can't change it. drawings should be in the balance sheet. It is not an expense so not in the P&L. You need to get year end adjustments from your Aucountant. These will need to include any depreciation etc and should be posted on the last day of the year before you lock sage down or your brought forward figures will be incorrect.
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Joanne
Winner of Bookkeeper of the Year 2015, 2016 & 2017
Thoughts are my own/not to be regarded as official advice,which should be sought from a suitably qualified Accountant.
You should check out answers with reference to the legal position
Assuming you're using the standard chart of accounts in Sage the 3000 series of nominal codes all represent aspects of "ownership interest" of some sort or another. 3010 is capital introduced by the owner, 3050 is capital withdrawn ("drawings") by the owner. If you wish to have these set to zero at the start of each year, you would journal the previous year end balance to the 3000 account. The "Capital and Reserves" total remains the same as the journal is just shifting figures around within the overall heading. Some accountants will include these clear downs as part of the adjustment set they provide at the end of the year to prepare for the next year. If this adjustment is done, no need to subtract the previous year.