Retirement tax questions

The 1099R has the post tax amount in box 5 if that makes a difference.  Would I leave box 5 off the IRA rollover entry and show the box 5 amount in box 1 and box 5 for the roth rollover? I also read somewhere that the code for the post tax must be an H, not the G shown in box 7.  Is that correct? When I split it in turbotax it didn't seem to change the tax amounts at all.