How To create a Portfolio page and Columns
You can select several layouts for a portfolio page.
First go to your Admin Panel > Pages > Add new, you can put any title, in this case "Portfolio".
On the Template dropdown select one of the Portfolio templates:
Then you can select which portfolio to display on this particular page, for that select one from the dropdown here:
That's it, you can switch to any template layout as many times you want.
Also as you can see above, you have the option to choose between 1 or 4 columns for your portfolios.
Just use that option to change how many columns you want on that portfolio page: