With Kintone, you can create an app that can be used for auto-calculating total travel expenses for each month and reporting or approving the expenses.
The following are the points for creating the app:

Points:

• Use a table to manage travel expenses on a monthly basis.
• Use a formula to auto-calculate total travel expenses for each month.
• Use the Process Management feature to set up a travel expense approval process.

This article provides example settings for each point.

Tables are useful for managing travel expenses on a monthly basis. Create a new record each month and register daily travel expenses in the table in the record. When registering a daily travel expense entry, add a new table row.

Configure the setting in the app as described below:

• Place a table on the app form.
  Adding/Deleting Tables on an App Form

• In the table, place fields to be used for registering daily travel expenses.
  Example: Date, Destination (a "Text" field), Mode of Transportation (a "Drop-down" field), Cost (a "Number" field)

To auto-calculate total travel expenses, place a "Calculated" field on the form and set a formula. By placing a "Calculated" field on the form and setting a SUM function that references the values in the table, you can calculate the sum of the values in the table.
Setting Formulas
SUM/CONTAINS Functions: Calculations in Tables

Configuring the app in the following manner, you can calculate the total travel expenses for each month.

• On the app form, place a "Calculated" field outside the table.

• Configure the "Calculated" field as described below:

  • Field name: "Total Expenses"
  • Formula: "SUM(Cost)"^*

  ^*For the value enclosed in ( ), specify the field code of a field whose values you want to add up.

To set up a travel expense approval process, use the Process Management feature.
It is a feature that enables users to create a process (workflow) for multiple users to edit and check records.
Configuring the Process Management setting

Configure the setting in the app as described below:

• In the Process Management setting in the app settings, set statuses such as "Unsubmitted (Draft)," "Processing," "Approved," and "Sent Back."
• For each status, set an assignee, conditions, an action name (button name), and so on.

When the setting is configured, the button to report/approve travel expenses is displayed on the record.