If you haven't saved since you deleted the row you can click the Undo button to bring it back, then drag it to the bottom. Then delete the row, or better yet, Hide it instead. That way you can get it back if you need it. If it's too late to bring it back, try clicking on the option for "Follow Assembly order". Assuming the deleted row wasn't the first item inserted into the assembly, that will move the skipped number further down in the BOM. Then you can un-check that and drag the rest of the rows above it. In the future I'd suggest moving a row to the bottom first, then hide it. Or better yet, open the assembly, right-click on the component in the tree, choose the "Component Properties..." icon, and check the box at bottom right for "Exclude from bill of materials."
That works Glenn. Thank you sir.