Solution
The PCIe-6363 has 2 output ports/connections. Each of these has 2 analog outputs. Therefore, the PCIe-6363 has 4 analog outputs. With the PCIe-6363 you can not have more than 4 analog outputs, regardless of the connector block (such as BNC-2110) used.
To use all 4 analog outputs of the PCIe-6363, you will need two connector blocks, one for each port on the PCIe-6363.
The below figure shows the pinouts of the PCIe card. Pins 21 and 22 on both ports are the analog output channels.