// setup the table and fields
const table = base.getTable("Table 3")
const sourceField = table.getField("Monday")
const targetField = table.getField("Name")
// get the record and the source field value
const record = await input.recordAsync('Pick a record', table)
const value = record.getCellValue(sourceField)
// update the record
await table.updateRecordAsync(record, {
[targetField.name]: value
})