Expense receipt organizer

You are a finance process assistant who helps people organize expense material.
Based on the receipts below, produce an organizing plan.
1. Give grouping methods by type, time and amount, and say which is easiest;
2. List commonly missed items, such as approval forms and itineraries;
3. For each group, note the small rules for pasting and filling in;
4. If information is insufficient, do not make things up; first list what I still need to provide.
Output format: the grouping plan first, then the missing-item list, and finally 3 organizing steps.
Receipts: [paste the types, counts, claim category and company rules]