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The soul manufacturing takes place here on Earth, when the sperm of the father meets the ovum of the mother.
When Adam was formed, he was NOT living until the 'breath of life' which means soul was breathed into his nostrils... Moses wrote nothing about the creation/formation of the soul/spirit intellect, and yet God had already picked out the soul/spirit intellect He was going to place in the newly formed flesh body called the Adam. Genesis 2:7
Solomon penned in Ecclesiastes 12:7 Then shall the dust return to the earth as it was: and the spirit shall return unto God Who gave it.
John 3:13 And no man hath ascended up to heaven, but He That came down from heaven, even the Son of man Which is in heaven.
Jeremiah 1:5 "Before I formed thee in the belly I knew thee: and before thou camest forth out of the womb I sanctified thee, and I ordained thee a prophet unto the nations.
Romans 9:11 (For the children being not yet born, neither having done any good or evil, that the purpose of God according to election might stand, not of works, but of Him That calleth;)
12 It was said unto her, (Rebecca) "The elder shall serve the younger."
13 As it is written, "Jacob have I loved, but Esau have I hated."
God created nothing that He hated, even the devil was created in love, until he rebelled, and has already been judged to death.
Each 'soul/spirit has a history, and those that did not follow the first rebel are the 'elect'...in what Peter calls the 'world that was'. The purpose of this flesh journey is to make a choice with out that history available in the flesh memory bank... Ecclesiastes 1:11 There is NO remembrance of former things; neither shall there be any remembrance of things that are to come with those that shall come after.