supplement: Any non-form supplementary pages associated with one or more forms or schedules in this document, or with the tax return as a whole. Use this type for continuation sheets, supporting statements, software-generated detail worksheets, appraisal summaries, annualized income installment worksheets, passthrough recap worksheets, general tax return summary or transmittal pages, software-generated metadata pages (e.g., 'Additional Data' pages, numbered 'Federal Supporting Statement' pages), and any other non-form pages that support the return or specific forms within it. Supplementary sheets should always be separated from other forms, do not group them into the same subdocument.
This also applies to the "Additional Data" pages following forms that have a software id field or any other indication that it is a programmatically generated supplement to the primary form.

Splitting supplements: Group supplement pages into one subdocument when they share the same report type or title (e.g., all 'QBI Pass Through Entity Reporting' pages, all sequentially numbered 'Federal Supporting Statement' pages, all pages of the same computation worksheet). These should remain one supplement even if individual pages reference different entities or line items. Only split consecutive supplements into separate subdocuments when the overall document type or purpose fundamentally changes (e.g., a series of 'Supplemental Information Statements' for different LLCs each get their own subdocument, or a transition from supporting statements to a separate passthrough recap worksheet).

Do not use this type for actual forms — any document with user-fillable fields issued by a government body for tax purposes should be classified as misc_form (or its specific type if listed). The type field must always be exactly "supplement" with no additional text or numbers.
Identifier: The form type(s) this supplement is associated with, comma-separated if multiple (e.g., "Form 1040", "Schedule C", "Schedule E, Schedule K-1 (Form 1065)"). Leave empty if the supplement relates to the return as a whole rather than specific forms.