If table 1 is not populated by a lookup and you want table 2 to have the same amount of rows, you will have to use JavaScript. The basic procedure is:

1. Add a new field to the form and hide it with field rules.
   1. You can use a formula to populate the number of rows in this table COUNT(Table1.EquipmentID). 
   2. Change the number 51 (two occurrences) to the field ID of this new field
2. Use JS to watch for changes to this field
3. Grab the values of table 1's Equipment ID column
4. Set the values of table 2's Equipment ID column

The only issue is if they begin work on table 2 then edit table 1 they will have their IDs overwritten in table 2. Let me know if this is an issue and we may be able to work around it.

 

const updateTableRows = async (tableFieldId, rowCount) => {
  const currentTableFieldValues = LFForm.getFieldValues(tableFieldId);
  const curRowCount = currentTableFieldValues.length;

  if (curRowCount < rowCount) {
    await LFForm.addRow(tableFieldId, rowCount - curRowCount);
  } else if (curRowCount > rowCount) {
    await LFForm.deleteRow(
      tableFieldId,
      ...Array.from(Array(curRowCount - rowCount)).map(
        (_, i) => curRowCount - i - 1
      )
    );
  }
};

let lastFieldValue = null;

LFForm.onFieldChange(
  async () => {
    const fieldValues = LFForm.getFieldValues({ fieldId: 51 });

    // Check if the field value has changed since the last time a row was added
    if (fieldValues[0] !== lastFieldValue) {
      // Update the table rows with the new row count
      await updateTableRows({ variableName: 'tbl_perDiem' }, fieldValues);
      lastFieldValue = fieldValues; // Update the last field value
    }
  },
  { fieldId: 51 }
);