Call Powershell script from another Powershell script
I solve my case using $PSScriptRoot, I hope my answer can help somebody more

The final code ends:

param(
[String] $pathfolder, #variable used to get the actual location of the folder from where is execute the PS1 file. 
[Parameter(Position=0, Mandatory=$true)]
[string] $svrinstance,
[Parameter(Position=1, Mandatory=$true)]
[string] $dbuser,
[Parameter(Position=2, Mandatory=$true)]
[string] $dbusupassw,
[Parameter(Position=3, Mandatory=$true)]
[string] $dbname
)

$sqlinstance    = $svrinstance
$userdb         = $dbuser
$passdb         = $dbusupassw  
$namedb         = $dbname

try
{

 Write-Output "Baseline Script to Set Up Confirmation Manager Database"
 $pathfolder = Split-Path -Parent $MyInvocation.MyCommand.Definition

 if($pathfolder -ne $null)
 {
    Write-Host $pathfolder
    $psfile = $PSScriptRoot + ".\FileStreamAccess_Validation.ps1"
    .$psfile $sqlinstance $userdb $passdb

 }

}
catch
{

}