You have choices to edit the timesheet created in QB from the tsheets sync or to override the hours when you review each paycheck before creation during the payroll process.
Let me share a best practice when paying a portion of hours prior to regularly scheduled payroll. Record the advance as just that, an emoyee advance (current asset) and when it comes time to run payroll deduct the advance (as a payroll item affecting the advance) in the extra additions deductions section of the paycheck view.
Doing so ensures that applicable overtime is paid and not forgotten. (Federal is anything over 40 in a calendar week is time and a half unless agricultural, some local rules are harsher such as anything beyond 8 in a day)