To create a user-defined debug probe in the Vivado IDE Hardware Manager, in the Hardware window, right-click the ILA core that you want to probe and select Create User Defined Probe.
This brings up the Create User Defined Probe dialog box. Select the ILA core you want to create the probes on, the name of the new probe, and finally the probe bits, and/or constants that make up this new probe.
To add specific probe bits to this new probe, click the "+" button and select Add Probe.
This brings up the Add Probes dialog that allows you to choose an existing probe or specific bits of an existing probe.
You can also add or remove bits in the Create User Defined dialog box. Move specific bits up or down as shown in the following figure.