Pre 2020 dated transactions

I have multiple portfolios and I am trying to upload data for the portfolio which has transactions since 2009 onwards. How do we add Pre 2020 trades so it shows correct return profile such as XIRR and other returns. Even if we cant upload, we should be able to upload transactions manually on older dates. If dividends/rights/splits cant be synced on auto, we can do it manually , but the option should be there

I would like to really appreciate what you have done. This is what i was looking for, Great work.