> **Source:** https://knowledge.leegality.com/document-execution/workflows/v4/understanding-v4/packs-and-documents
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---
# Packs and documents

v4 workflows organize documents in a three-level hierarchy. This guide explains the structure.

## Document hierarchy

```mermaid
graph TD
    A[Document Pack] --> B[Primary Document 1]
    A --> C[Primary Document 2]
    A --> D[Primary Document 3]
    B --> E[Sub-document A]
    B --> F[Sub-document B]
    C --> G[Sub-document A]
    D --> H[Sub-document A]
    D --> I[Sub-document B]

    style A fill:#e1f5ff
    style B fill:#fff4e6
    style C fill:#fff4e6
    style D fill:#fff4e6
    style E fill:#f0f0f0
    style F fill:#f0f0f0
    style G fill:#f0f0f0
    style H fill:#f0f0f0
    style I fill:#f0f0f0
```

### Sub-documents

**Individual PDF files** you upload when running a workflow.

- The basic building blocks
- Can be any PDF document
- Combined to form primary documents

**Example:** loan_terms.pdf, repayment_schedule.pdf, property_details.pdf

### Primary documents

**One or more sub-documents** that function as a single document.

- Each primary document is signed independently
- Has its own audit trail
- Generates its own signed copy
- Can be assigned selectively to invitees

**Example:** Loan Agreement (primary document) = loan_terms.pdf + repayment_schedule.pdf

### Document pack

**Collection of all primary documents** sent together in one workflow run.

- Contains one or more primary documents
- Sent to invitees in a single action
- Enables unified signing journey
- Tracked as one pack with individual document status

## How it works

### Each primary document signed independently

Invitees sign each primary document separately:
- Loan Agreement → Signed once (covers all sub-documents)
- Property Documents → Signed once
- Insurance Policy → Signed once

Each primary document has:
- Own audit trail
- Own signature coordinates
- Own completion status
- Own signed PDF

### One signing session for all

While primary documents are signed separately, invitees complete everything **in one session**.

## Key points

> **Info — Important concepts**
>
> **Sub-documents:**
> - You upload these PDF files
> - Multiple sub-documents can form one primary document
> - Signers don't see sub-document boundaries—they see one combined primary document
> 
> **Primary documents:**
> - This is what gets signed
> - Each has independent audit trail
> - You can assign different primary documents to different invitees
> 
> **Document pack:**
> - All primary documents together
> - One sending action
> - Unified tracking

## Next steps

- [Learn about document assignment](https://knowledge.leegality.com/document-execution/workflows/v4/understanding-v4/document-assignment)
- [Understand distributed stamping](https://knowledge.leegality.com/document-execution/workflows/v4/understanding-v4/distributed-stamping)
- [Learn how to run a workflow](https://knowledge.leegality.com/document-execution/workflows/v4/run-workflow/run-a-pack)