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=IFERROR(COLLECT([Completed Date] - [LTP Conversion Date], AND(IFERROR(MONTH(@cell), 0) = Feb84, IFERROR(YEAR(@cell) = 2023, 0)), {CAD Support Type TD}, ="Long Term Project")), "N/A")
The bold is what I want to subtract within the formula.
You need either a row number or "@row" reference after the first two cell references, and you have one too many closing parenthesis after "Long Term Project". What exactly are you trying to accomplish with your formula?
ref must be one of: categoryID, siteSectionID, category, category/categoryID, category/name, category/description, category/url, category/allowedDiscussionTypes, locale, siteSection, siteSection/basePath, siteSection/contentLocale, siteSection/sectionGroup, siteSection/sectionID, siteSection/name, siteSection/description, siteSection/apps, siteSection/attributes, layoutViewType, discussionID, commentID, page, latest, sort, sortType, lookupSort, discussion, discussion/name, tags, breadcrumbs, discussionApiParams, serverDraftID, serverDraft.