You can shift + click to multi-select primers in order to link them and form Primer Pairs. You can either multi-select rows from the primer tab, or directly on the sequence map.
Once you select your two primers of interest, right-click the highlighted region between them to access the Link Primers option.
Alternatively, if you open the Primer Pairs tab, you will notice a Link Primers option appear when you have shift + clicked two primers that can be linked.
