In Quickbooks Desktop editions, you have the ability to take an existing estimate and save it as a recurring transactions. All your pricing is retained and you can choose your invoicing recurrence pattern (e.g, on the first of the month for 12 months).
In Quickbooks Online edition, when you choose the MAKE RECURRING option on an invoice, it automatically deletes any existing pricing information that was in the invoice.
While LMN can export your estimates to Quickbooks, we can't control what happens after the export. You can direct questions/suggestions for improving this process to Intuit's support site.