There were a few things that I did not understand about waqf bir rawm and waqf bil ishmaam.

  Question
As salamu alaikum, there were a few things that I did not understand about waqf bir rawm and waqf bil ishmaam.

For waqf bir rawm: If the waqf is being done on a raa' that originally carries a kasra under it, but becomes tafkheem due to waqf (bil iskaan), will it become tarqeeq due to waqf bir rawm? For example, the last letter of the last word of the second ayah of Surah Qamar. And is the opposite of that also true? For example, in surah Yasin, wa-la llaylu saabiq un nahaar(i), stopping with a normal waqf renders it Tafkheem and continuing renders it Tarqeeq. What about waqf bir rawm? Also the opposite as in the last word of the second ayah of surah Qamar.

For waqf bil ishmaam: How does one make ishmaam on a lip letter when stopping for example the meem. Innahoo la qur'aanun kareem(un). Does it require closing the lips and then reopening without making a sound?

JazakumUllah khayran

Answer
Wa alaikum assalaam wa rahmatullahi wa barakaatuh
The rules for  are as when one continues reading.  So if the last letter, such as a has a dhammah and preceded with a ya' saakinah as in: , when stopping with a regular sukoon, the will have tarqeeq.  When continuing reading  however the would have tafkheem.  So when stopping with a , there will be tafkheem of the.  
The opposite case would be similar to the second example in the question: When stopping on the word with a complete sukoon the has tafkheem.  When stopping with a (giving 1/3 of a count to the kasrah on the though it would be like continuing, with the read with tarqeeq.

The steps of making ishmaam is first making a sukoon and then making a dhammah of the lips with no accompanying sound.  So when stopping with ishmaam on a meem with a conjugated or fixed dhammah, one first closes the lips, then the lips move out in a dhammah. 
Please also see:
http://www.abouttajweed.com/stopping-on-the-ends-of-words/stopping-on-the-ends-of-words-1.html

http://www.abouttajweed.com/stopping-on-the-ends-of-words/stopping-on-the-ends-of-words-2.html


Wa iyyaakum