If you delete an entire Pie from your Portfolio, all the securities held within that Pie will be liquidated and the proceeds will be reinvested in your portfolio according to the target allocations you set.
To remove an entire Pie from your Portfolio, start on the "Invest" tab, under "Portfolio." Click on the turquoise "Edit" button.
Check the box next to the pie you wish to remove. Once you do so, a turquoise "Remove" button will populate at the top of the page. Click "Remove."
After clicking "Remove," you will need to adjust the target percentages for the remaining Slices to ensure that the total percentage equals 100%. Once you have done so, you will be able to click "Save" in the upper-right hand corner.
Please note that your Portfolio will always need a placeholder, so you will not be able to remove everything before starting over and adding new Slices. If you only have one Pie in your portfolio, you will need to add the new Pies/Slices before removing the original.