Well, generally, there's no such thing as asset management as such. You can think of assets as objects in R that can have multiple attributes, such as a ticker (or other unique identifier), date of acquisition, basis, yield, if any, volatility, if known, and various financial measures such as \beta and copula, etc., etc. What tool to use depends on what attributes you want to manage, and whether you want to manage them at an instant or over time (using time series analysis).
So, my advice is first to decide on what aspects of what type of assets it is desired to manage. Plus, remember the first rule of asset valuation (at least in assets for which there is a market): It's worth what the best opinion of what market participants think it is.