How do I increase the cost base of a share in the Super Fund were there are varying cost bases eg DRP

This an issue with the recent changes to the super rules if you have member balances of more than $1.6m. As a concession you are entitled to increase the cost base of assets which you would do where there is a profit to be realised if shares are subsequently sold. Where I have purchased one parcel of shares you can increase the cost base through the return of capital option. If you have maded multiple puchase of shares (including DRPs) I cannot see how to change the cost base of each purchase.