You can enter 01012023 for the Fiscal period start date.
Unless you know that the partnerships has ended/gone out of business, just put no.
For box 171, you would have get the income type from whoever issued the slip.
Box 030 is automatically calculated by TurboTax based on what is entered in boxes 151 to 158. You will find these boxes in TurboTax Online by clicking on the blue link "Boxes 151 to 158" next to Capital gains (losses).
For box 135, you need to enter the total foreign income, which is usually the sum of all the box 135s, but there are instances when first box has a grand total and all following ones are a breakdown per country.
To split your T5013 with a spouse, you would have to enter a T5013 for each spouse and manually calculate the split amounts.
