Bulk Change Category

Is there an easy way to bulk change (amend) a category in Mac version? I have 560 transactions were the Tax:Income Tax category has changed to Uncategorised. Rather than individually opening each transaction and updating I'm trying to see if there is a bulk way to do this. Previously had had used a Windows versions, and recall you could use "Find & Replace", or even use a merge function on categories (redefining all category "A" to category "B"). But I cannot see how I can do this on the Mac (Canadian) version.