A portal is built from the sheets you already have. You are not rebuilding your data — you are choosing which parts of it face outward.
Answer these before touching the builder:
The third question is the important one. Get it right on paper and the build is mechanical.
Add the pages a client needs — typically an overview, their work, and a way to ask for something. Each page pulls from a sheet, scoped so a client sees only their own records.
Keep it to a handful. A portal is not your workspace; it is the two or three things a client actually wants to check.
Set your logo and colours so it reads as your company. Clients rarely know or care which tool is underneath — what matters is that it looks like you.
Non-negotiable. Sign in as a test portal user and walk every page.
Five minutes here is much cheaper than a customer discovering something they should not see.
Invite one friendly client first, ask them what was confusing, fix it, then roll out. See Portal users and access.
Related: What is the client portal? · Portal users and access · Build a form and collect responses