Here's how I have it so far:
First Tab: Overview
1) Displays the total portfolio value
2) Displays the value per asset
3) Displays the ratio of asset to total to 1 decimal place (i.e. what percentage is the asset at relative to the whole)
4) Displays the % of overall assets that are tax-sheltered (i.e. in IRAs, annuities, I-Bonds, physical gold coins, etc)
5) Displays the % of overall assets that are creditor-protected (i.e. IRAs/Annuities/401k)
6) Displays a "Test Field" where I may add prospective new contributions to a certain asset, and it displays a change in the asset ratios (i.e. if I contribute $5k to Bonds for my 2011 IRA, it displays the new % ratios of each asset)
7) Monthly withdrawal capability based on 2%, 3% and 4% withdrawal rates (i.e. to let me see if I am financially independent if my portfolio holdings are enough to sustain my monthly living expenses)
Second Through Fifth Tabs: One Tab Per Asset
1) Displays the Total of that asset
2) Displays the total tax-sheltered from that asset
3) Displays the total creditor-sheltered from that asset
4) Displays some specific breakdowns for that asset (i.e. in Cash, what percent are I-Bonds, what percent are Physical T-Bills, etc)
Of course Tab 1 links to values from Tabs 2 through 5 so I just input the data once.
Sixth Tab: Projections
1) Displays a monthly timeline for the next 5 years
2) Displays estimated portfolio contributions per month
3) Displays estimated total portfolio value per month
4) Field to enter estimated annual growth rate
5) Sensitivity analysis to show effects of deviations from the estimated growth rate
Seventh Tab+: Historical Data
I haven't built this yet, but I may have it pull in data from the Overview page. I.e. on the first of the month I may manually paste the portfolio totals, and the percentage per asset into one sheet. I can then compare this to my projections, as well as calculate my individual portfolio growth rate
I'll probably build a few graphs from this data as well for a quick image summary.
I've been hesitant to track my portfolio growth because it's not actionable. Regardless of whether the PP did +30% last year, or -30%, it doesn't affect how I will invest next year. Since I can't act on the information, it's wasteful to calculate and analyze. Thus, I may skip on that specific calculation, but I do like looking at deviations from actual portfolio to projected portfolio because that is actionable. I may use that to estimate how much longer I need to work to sustain financial independence, which is my overall goal.
My personality is to make things a little complex, so while most people can get away with a one page spreadsheet that has 9 cells on it (nominal value per asset, total assets, ratio per asset), I like to play around a little more as part of my hobby. Any ideas on what else to build in, if nothing more than to practice playing with Excel? Maybe I'll add in some If/Then statements to make the ratios appear RED if it's <15% or >35%
