individual channel

Click the appropriate channel to select it. To deselect the channel, click the channel again.

all channels in the system

Click the Channels heading in the top left corner of the table to select all channels. If some channels are already selected, then clicking the Channels heading inverts your selections (selected channels are deselected, and unselected channels are selected).

all channels in a card
(row)

Click the card identifier in the left column to select the whole card. If some channels are already selected, then clicking a card identifier inverts your selections (selected channels are deselected, and unselected channels are selected).

all channels with the same number in all cards

Click the channel number heading (for example, 04) to select all channels with that number. If some channels are already selected, then clicking the heading inverts your selections (selected channels are deselected, and unselected channels are selected).