Soil on Grass

This may seem a bit of a daft one but........

I have done a bit of digging reseeding of the grass at the edges of the front 'lawn' in order to raise and lower the level to match the pavement/path.  A couple of things are now eveident.   I appear not to have used as much seed as I should have done and the levels are also not as good as I had hoped.  Primarily the soil I put down before seeding has got lower (possibly I did not tread it in hard enough).  The question is can I just add soil on top of what I have sown?  My hope is that the grass will grow through it (it seems to work everywhere else that I do not want it!!).  Or will I have to (effectively) start again?  Thanks

You can if you add it gradually of a period of weeks-I am would also suggest mix some grass seed into the sieved sill or compost and you have covered both bases-do not over do it or the existing grass will struggle.

Could you not slide your spade into the soil below the new grass lift slightly and poke some soil in to raise levels?

Thanks to both for your replies. Think I just needed someone to pat me on the shoulder and say - yep that will be OK!! Cheers

Soil on existing grass was how we levelled bowling greens.
Each year at the end of season there would be runs or folds.
After scarifying and aerating we would put a load of lawn soil on the green and rake it in leveling with a long plank. The soil contained seed and fertiliser it was then left to over winter and we would then cut it dropping the blade to find a perfect sward.
Slight hollows would get the same treatment it must have worked as we got many a slap on the back for a nice smooth lawn.
Use a good compost mixed with agricultural washed sand and mix the seed into it, rake it level using a plank from the lawn to the paves leaving the lawn side slightly high as it will settle. If too high push a spade in and lift enough to remove soil with a trowel drop the sod back and water well.

Frank.