You can't drag and drop if you're using IC5141. You can only use the analysisOrder approach. You didn't say which version you were using (see the forum guidelines, please), so I had to give both options.
You also didn't explain that you were trying to utilize the final operating point of the transient to start the DC.
First of all, does your DC start from precisely the same conditions as are in place at the end of the transient (in other words, the value of all inputs and also the values of the thing you're sweeping must correspond to the value it was at the end of the transient). If it doesn't match, then using the oppoint doesn't make much sense.
Other things to try:
- In the additional parameters at the bottom of the DC options form, type "useprevic=ns" (or "useprevic=yes").
- In the transient, the writefinal is probably set to "spectre.fc" (see the transient options form). On the DC options form, set readns to "spectre.fc" (i.e. the same file name).