Can the All Purposes Loan Agreement be setup as an "at call loan agreement"?

If you are preparing an agreement that relates to monies that are sent up from a company (which has excess funds) to a family investment trust looking to acquire an investment; and if rather you would like the loan to be "at call" so that it does not become fully payable at the end of the term, it is best to directly contact Abbott and Mourly to customise the loan for you. Our Loan Agreement do not suffice for "at call loan".