OK, then in each company you should have a balance sheet account named for the other company e.g. in Quickfile you should have a balance sheet account named “Company 2 inter-company account”, and in Sage you should have a balance sheet account named “Company 1 inter-company account”. The important thing to check every so often is that the balances match (i.e. are for the same amount (one will be a credit balance and the other will be a debit balance).
This is assuming that you own (are 100% shareholder of) both companies.
You shouldn’t need to use the DLA in this instance, as the DLA is for your transactions with the company as an individual.