Adding a new tag group and the associated tags
Go to Configuration > Data > Tags > Tags.
Select the Add button.
In the Create tag group popup:
in the Tag group section:
in the Tag group text field, enter the tag group name
for the All customers checkbox, select the required value:
selected (default) - this tag group will be available for all customers
cleared - select one or more customers from the left-hand side pane by clicking on the customer name to highlight it and selecting the blue arrow button
. Alternatively, double-click on the customer name.
in the Tags section create individual tags:
in the Tag text field, enter the required tag
for each individual tag select for which customers it will be available:
All customers - this option is available only when All customers checkbox has been selected in the Tag group section
Specific customers - the list of available customers depends on the selection made in the Tag group section of the popup.
Click on the customers names and use the blue arrow buttons
and 
to either add or remove customers from the list in the right-hand pane. Alternatively, double-click on the customer name.
Note
XTM automatically replaces spaces with underscores.