Adding long text entries to cells - comments or script?

Hi,

I have a long list of customer records and use pivot tables to filter as required. For each customer I tend to have to insert long amounts of text, i.e. case notes, on a regular basis. I have been using the add comments facility but think there must be a better way. Can script be used to create a popup box for each cell, i.e. linked to the customer reference or case status?

Any ideas welcome.

thanks

Andrew