Special columns in portfolio

[Chavadam]

Hello
I'm new in Google Finance.

I observed the portfolio features in Google Finance, especially the
existing columns per default. Hence these questions, please:

1) Is it possible to add columns to portfolio's ? Containing
calculated values like
- percentages based on two existing colums
- =MAX(value1; value2) (! where value2 is the column cell itself !)

2) Is it possible to remove colums in the basic portfolio ?
For portfolio's following the buy/keep/sell advises of an advisor's
periodical. No 'Quantity' nor 'Total' columns are necessary; only the
quote changing daily.

Or do I have to use Google Spreadsheet to get a solution for each of
both cases ?
Then I would need to keep share prices updated in these
spreadsheets ...

Thanks for your answer.