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If you search this forum, you'll see this is a fairly common issue with smaller proprietorships and new companies.  

setup, settings, company, credit cards used

setup two cards, include the last 4 digits of the card, ie

  personal mc 1234

  business mc 9999

the payable account for the first is shareholder loan, the second is m/c payable

if the owner buys something with the personal m/c, that's what you pay with (using pay expenses)

if the owner buys a personal item with the business m/c, you expense s/h loan and pay with the business m/c

at month-end, a general ledger report of the s/h loan account will indicate if/how much to reimburse the owner

Manually calculate the personal and business transactions. Only put down the business expenses into the ltd company. I do that all the time, but its a little bit more work. I have finally dedicated credit cards for business and personal.