Hi mlawler,
In this type of issue, we do recommend reaching out to your accountant for an accurate solution. But to give you an idea, yes, you can add tax credits in MYOB to claim back GST and receive a refund from the government. When you import goods from overseas and pay for them, you account for this transaction in MYOB. Upon the arrival of the goods, you pay the GST value to the government and record this transaction in MYOB as well. You can also visit this help pages for more information:
How To Claim GST: Goods And Services Tax Refunds
GST Reimbursements And Credits: The Complete Guide
Regards,
Earl