Hi,
You need to "pass through": A --> B --> C
c:index --> set "Link ID" property. Note there can be no repeated values.
b:index --> set as Link ID, AND set as reference to table c. Here also, there can be no repeated values.
a:index --> set as Link Reference, pointing to table B.
Note: prior to JMP 15, columns could not simultaneously serve as both link ID and link Reference, so an additional "dummy" column must be created in each table thru which you intend to pass.
Cheers,
Brady