Linked columns: showing a field from a related table — When the link reaches several records

Some routes land on one record — a deal's company. Others land on many: a customer's orders, a company's contacts, a deal's activities. A linked column never turns one row into several; a row is a record, and it stays one. Instead it asks what you want from the many, as soon as the picker notices the route fans out. • List them — the values, comma-separated, de-duplicated. Good when the names are the answer. Up to 25 show before the rest become a count. • Count — how many records the route reaches. Usually the right answer, which is why it's the default. • Sum, Average, Min, Max — offered when the field at the end is a number. A column that counts or totals is a rollup, and behaves like one: right-aligned, showing 0 rather than a dash when nothing is linked, because 0 is the answer.