How to add Subcategories within a Reason list?
This covers adding a subcategory to a downtime reason list in Fusion Manager, for when you need finer detail when diagnosing a problem.
Adding subcategories can help you get more granular when diagnosing downtime, but keep your operators in mind — too many levels can create confusion, so keep the tree as shallow as you reasonably can.

Step 1 — Open Reasons
From the left menu, select Reasons.

Step 2 — Select the parent reason
Tick the checkbox next to the downtime reason you want to add a subcategory under.

Step 3 — Add a child category
Click the + icon and choose New Child Category.

Step 4 — Name the subcategory
Enter a name for the subcategory.

Step 5 — Add reasons under the subcategory
Click the + icon on the right and choose New Reason to add root-cause reasons under your new subcategory. For a detailed walkthrough, watch this video.

Step 6 — Save your changes
Click Save to save all your changes.

Step 7 — Open Reasons Assignment
Go to the Reasons Assignment tab to make your new subcategory and reasons available on a line.

Step 8 — Assign your new subcategory and reasons
Tick the checkbox next to your unassigned subcategory and reason(s), then click the tick to assign them to the appropriate line. Click Save to confirm.
Ticking a category assigns everything it contains at that moment — it's a one-off shortcut, not an ongoing link. If you add more reasons under this subcategory later, you'll need to assign each new one individually; re-ticking the category won't pick them up automatically.
