We use smartsheets to run our customer projects. The approach we have used to date is to create a workspace for each customer, with the necessary sheets - all from a template. This works really well, as the customers need to review and contribute to several of the sheets that we use, and the workspace sharing feature lets us easily share the whole set at once.
The problem that we are facing is that there is some project information that we want to keep internal to our customer, but still group by project. These might be risks and issues, financial information, etc.
Can anyone suggest a better approach where we can keep the positives of our current arrangement (easy sharing of multiple files with our customers) but also address the need to limit what within the files customer users can see?