Is Vedanta the conclusion of Vedic Samhitas? Can we proove Vedantic Philosophy from Vedic Samhitas, Brahmanas and Araynakas??
Ishopanishad is in the samhita portion of its shakha (it is the 40th adhyaya of Vajasaneyi Samhita of Shuklayajurveda).
The Maitrayani Upanishad belongs to Maitrayani Samhita of the Krishna Yajurveda. It talks exclusively on the superiority of the Brahman.
Thus some upanishads are itself part of the Samhita.
Further, please see the following link. The link also provides a detailed comparison of the sentences in the samhitas and upanishads indicating that the philosophy behind both of them are exactly are the same.
Hindu tradition considers the Veda Samhitās and Upaniṣads as forming integral parts of a single canon of orthodox scripture, the Veda. There must have been a really good reason for this. The reason is that the Veda is thoroughly consistent in its subject matter and fundamental metaphysics and philosophy, beginning with the Samhitās all the way through to the Upaniṣads.