The following steps will guide you to unlock all cells in current firstly, lock required cells and ranges, and then protect current worksheet. Please do as follows:

1. Click the Arrow at the upper-left corner of worksheet to select all cells in active worksheet.

2. Right click any selected cell, and select the Format Cell item from the context menu. See below screenshot:

3. In the Format Cells dialog box, uncheck the Locked option under Protection tab, and click OK button. See above screenshot:

4. Select cells and ranges that you want to lock, right click and select the Format Cell item from the context menu.

5. In the Format Cells dialog box, check the Lock option under Protection tab, and click OK button. See above screenshot:

6. Click Review > Protect Sheet to protect current worksheet. See below screenshot:

7. Enter a password in the blank box in the popping up Protect Sheet dialog box, and click the OK button. And then retype the password into the another Confirm Password dialog box, and click the OK button. See screenshot above.

And now it locks and protects only cells and ranges you selected in the Step 4, while unselect ranges are editable.

Kutools for Excel's Selection Unlock utility and Selection Lock utility enable you to unlock/lock all selected cells with only one click, and then you can protect the whole worksheet with allowing unlocked cells to be edited.

1. Click the Arrow at the upper-left corner of worksheet to select all cells in active worksheet.

2. Click Kutools Plus > Worksheet Design to activate the Design tab, and then click the Design > Unlock Cells. See screenshot:

Then a dialog box comes out to tell you selected cells have been unlocked. Just click the OK button to close it.

3. Select cells and ranges that you want to lock, and click the Design > Lock Cells.

Then click the OK button to close the popping up Kutools for Excel dialog box.

4. Click the Design > Protect Sheet or Review > Protect Sheet, and then you can follow the same steps we introduced in the first method to protect current worksheet.

If you have Kutools for Excel installed, it’s another Encrypt Cells utility can help you quickly lock and protect selected cells quickly. You can do as follows:

1. Select the cells that you want to lock and protect, and click the Kutools Plus > Encrypt Cells > Encrypt Cells.

2. In the opening Encrypt Cells dialog box, type your password into both Password box and Confirm box, select one of mask types, and click the Ok button.

Then you will see all selected cells are encrypted at once as following screen shot shown:

Note: You can decrypt these encrypted cells with clicking Kutools Plus > Encrypt Cells > Decrypt Cells, and then type you password into opening dialog box.

Quickly mass password protect multiple/all worksheets in Excel

Normally Excel's Protect Sheet feature can only protect active sheet. However, Kutools for Excel's Protect Worksheet utility enables to batch protect multiple (or all) worksheets with same password by only 2 steps.