OS version? Filemaker version? Your experience level?
Yes it can.
Every thing about a client that happens once (clientIDnumber, photo, name, address, etc) would be in the client table.
The notes can be a notefield that is timestamped and appended to the top of a NOTESfield in the client Table.
Or the notes can be separate records in a Notes Table that relates to the clientIDNumber.
If something happens more than once (appointments, notices)should be in a separate appointment Table related to clientIDnumber.